Allied Health Personnel: Health care workers specially trained and licensed to assist and support the work of health professionals. Often used synonymously with paramedical personnel, the term generally refers to all health care workers who perform tasks which must otherwise be performed by a physician or other health professional.Health Personnel: Men and women working in the provision of health services, whether as individual practitioners or employees of health institutions and programs, whether or not professionally trained, and whether or not subject to public regulation. (From A Discursive Dictionary of Health Care, 1976)Allied Health Occupations: Occupations of medical personnel who are not physicians, and are qualified by special training and, frequently, by licensure to work in supporting roles in the health care field. These occupations include, but are not limited to, medical technology, physical therapy, physician assistant, etc.Health Manpower: The availability of HEALTH PERSONNEL. It includes the demand and recruitment of both professional and allied health personnel, their present and future supply and distribution, and their assignment and utilization.Medical Secretaries: Individuals responsible for various duties pertaining to the medical office routine.Access to Information: Individual's rights to obtain and use information collected or generated by others.BooksAttitude of Health Personnel: Attitudes of personnel toward their patients, other professionals, toward the medical care system, etc.Midwifery: The practice of assisting women in childbirth.Library Collection Development: Development of a library collection, including the determination and coordination of selection policy, assessment of needs of users and potential users, collection use studies, collection evaluation, identification of collection needs, selection of materials, planning for resource sharing, collection maintenance and weeding, and budgeting.Military Personnel: Persons including soldiers involved with the armed forces.Health Knowledge, Attitudes, Practice: Knowledge, attitudes, and associated behaviors which pertain to health-related topics such as PATHOLOGIC PROCESSES or diseases, their prevention, and treatment. This term refers to non-health workers and health workers (HEALTH PERSONNEL).Health Status: The level of health of the individual, group, or population as subjectively assessed by the individual or by more objective measures.Public Policy: A course or method of action selected, usually by a government, from among alternatives to guide and determine present and future decisions.Health Services Accessibility: The degree to which individuals are inhibited or facilitated in their ability to gain entry to and to receive care and services from the health care system. Factors influencing this ability include geographic, architectural, transportational, and financial considerations, among others.Public Health: Branch of medicine concerned with the prevention and control of disease and disability, and the promotion of physical and mental health of the population on the international, national, state, or municipal level.Delivery of Health Care: The concept concerned with all aspects of providing and distributing health services to a patient population.Rural Population: The inhabitants of rural areas or of small towns classified as rural.Questionnaires: Predetermined sets of questions used to collect data - clinical data, social status, occupational group, etc. The term is often applied to a self-completed survey instrument.Health Policy: Decisions, usually developed by government policymakers, for determining present and future objectives pertaining to the health care system.Health Surveys: A systematic collection of factual data pertaining to health and disease in a human population within a given geographic area.Health Care Reform: Innovation and improvement of the health care system by reappraisal, amendment of services, and removal of faults and abuses in providing and distributing health services to patients. It includes a re-alignment of health services and health insurance to maximum demographic elements (the unemployed, indigent, uninsured, elderly, inner cities, rural areas) with reference to coverage, hospitalization, pricing and cost containment, insurers' and employers' costs, pre-existing medical conditions, prescribed drugs, equipment, and services.Personnel, Hospital: The individuals employed by the hospital.Health Promotion: Encouraging consumer behaviors most likely to optimize health potentials (physical and psychosocial) through health information, preventive programs, and access to medical care.Mental Health: The state wherein the person is well adjusted.Cross-Sectional Studies: Studies in which the presence or absence of disease or other health-related variables are determined in each member of the study population or in a representative sample at one particular time. This contrasts with LONGITUDINAL STUDIES which are followed over a period of time.Data Collection: Systematic gathering of data for a particular purpose from various sources, including questionnaires, interviews, observation, existing records, and electronic devices. The process is usually preliminary to statistical analysis of the data.Health: The state of the organism when it functions optimally without evidence of disease.United StatesHealth Care Surveys: Statistical measures of utilization and other aspects of the provision of health care services including hospitalization and ambulatory care.Attitude to Health: Public attitudes toward health, disease, and the medical care system.Health Planning: Planning for needed health and/or welfare services and facilities.Pregnancy: The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.Primary Health Care: Care which provides integrated, accessible health care services by clinicians who are accountable for addressing a large majority of personal health care needs, developing a sustained partnership with patients, and practicing in the context of family and community. (JAMA 1995;273(3):192)Quality of Health Care: The levels of excellence which characterize the health service or health care provided based on accepted standards of quality.Health Behavior: Behaviors expressed by individuals to protect, maintain or promote their health status. For example, proper diet, and appropriate exercise are activities perceived to influence health status. Life style is closely associated with health behavior and factors influencing life style are socioeconomic, educational, and cultural.Health Services: Services for the diagnosis and treatment of disease and the maintenance of health.Insurance, Health: Insurance providing coverage of medical, surgical, or hospital care in general or for which there is no specific heading.World Health: The concept pertaining to the health status of inhabitants of the world.Health Services Needs and Demand: Health services required by a population or community as well as the health services that the population or community is able and willing to pay for.Health Education: Education that increases the awareness and favorably influences the attitudes and knowledge relating to the improvement of health on a personal or community basis.Oral Health: The optimal state of the mouth and normal functioning of the organs of the mouth without evidence of disease.Health Services Research: The integration of epidemiologic, sociological, economic, and other analytic sciences in the study of health services. Health services research is usually concerned with relationships between need, demand, supply, use, and outcome of health services. The aim of the research is evaluation, particularly in terms of structure, process, output, and outcome. (From Last, Dictionary of Epidemiology, 2d ed)Public Health Administration: Management of public health organizations or agencies.Occupational Health: The promotion and maintenance of physical and mental health in the work environment.Health Expenditures: The amounts spent by individuals, groups, nations, or private or public organizations for total health care and/or its various components. These amounts may or may not be equivalent to the actual costs (HEALTH CARE COSTS) and may or may not be shared among the patient, insurers, and/or employers.Patient Acceptance of Health Care: The seeking and acceptance by patients of health service.Environmental Health: The science of controlling or modifying those conditions, influences, or forces surrounding man which relate to promoting, establishing, and maintaining health.Health Status Disparities: Variation in rates of disease occurrence and disabilities between population groups defined by socioeconomic characteristics such as age, ethnicity, economic resources, or gender and populations identified geographically or similar measures.Public Health Practice: The activities and endeavors of the public health services in a community on any level.National Health Programs: Components of a national health care system which administer specific services, e.g., national health insurance.Mental Health Services: Organized services to provide mental health care.Health Priorities: Preferentially rated health-related activities or functions to be used in establishing health planning goals. This may refer specifically to PL93-641.Delivery of Health Care, Integrated: A health care system which combines physicians, hospitals, and other medical services with a health plan to provide the complete spectrum of medical care for its customers. In a fully integrated system, the three key elements - physicians, hospital, and health plan membership - are in balance in terms of matching medical resources with the needs of purchasers and patients. (Coddington et al., Integrated Health Care: Reorganizing the Physician, Hospital and Health Plan Relationship, 1994, p7)Health Care Rationing: Planning for the equitable allocation, apportionment, or distribution of available health resources.Rural Health: The status of health in rural populations.Community Health Services: Diagnostic, therapeutic and preventive health services provided for individuals in the community.Women's Health: The concept covering the physical and mental conditions of women.Health Care Sector: Economic sector concerned with the provision, distribution, and consumption of health care services and related products.World Health Organization: A specialized agency of the United Nations designed as a coordinating authority on international health work; its aim is to promote the attainment of the highest possible level of health by all peoples.Urban Health: The status of health in urban populations.Child Health Services: Organized services to provide health care for children.Health Literacy: Degree to which individuals have the capacity to obtain, process, and understand basic health information and services needed to make appropriate health decisions.Personnel Management: Planning, organizing, and administering all activities related to personnel.Health Facilities: Institutions which provide medical or health-related services.Outcome Assessment (Health Care): Research aimed at assessing the quality and effectiveness of health care as measured by the attainment of a specified end result or outcome. Measures include parameters such as improved health, lowered morbidity or mortality, and improvement of abnormal states (such as elevated blood pressure).Rural Health Services: Health services, public or private, in rural areas. The services include the promotion of health and the delivery of health care.Community Health Planning: Planning that has the goals of improving health, improving accessibility to health services, and promoting efficiency in the provision of services and resources on a comprehensive basis for a whole community. (From Facts on File Dictionary of Health Care Management, 1988, p299)Military Medicine: The practice of medicine as applied to special circumstances associated with military operations.Quality Assurance, Health Care: Activities and programs intended to assure or improve the quality of care in either a defined medical setting or a program. The concept includes the assessment or evaluation of the quality of care; identification of problems or shortcomings in the delivery of care; designing activities to overcome these deficiencies; and follow-up monitoring to ensure effectiveness of corrective steps.Socioeconomic Factors: Social and economic factors that characterize the individual or group within the social structure.Health Resources: Available manpower, facilities, revenue, equipment, and supplies to produce requisite health care and services.Health Occupations: Professions or other business activities directed to the cure and prevention of disease. For occupations of medical personnel who are not physicians but who are working in the fields of medical technology, physical therapy, etc., ALLIED HEALTH OCCUPATIONS is available.Community Health Centers: Facilities which administer the delivery of health care services to people living in a community or neighborhood.Regional Health Planning: Planning for health resources at a regional or multi-state level.Medical Laboratory Personnel: Health care professionals, technicians, and assistants staffing LABORATORIES in research or health care facilities.Public Health Nursing: A nursing specialty concerned with promoting and protecting the health of populations, using knowledge from nursing, social, and public health sciences to develop local, regional, state, and national health policy and research. It is population-focused and community-oriented, aimed at health promotion and disease prevention through educational, diagnostic, and preventive programs.Personnel Staffing and Scheduling: The selection, appointing, and scheduling of personnel.Maternal Health Services: Organized services to provide health care to expectant and nursing mothers.Emergency Medical Technicians: Paramedical personnel trained to provide basic emergency care and life support under the supervision of physicians and/or nurses. These services may be carried out at the site of the emergency, in the ambulance, or in a health care institution.Occupational Health Services: Health services for employees, usually provided by the employer at the place of work.Health Benefit Plans, Employee: Health insurance plans for employees, and generally including their dependents, usually on a cost-sharing basis with the employer paying a percentage of the premium.Electronic Health Records: Media that facilitate transportability of pertinent information concerning patient's illness across varied providers and geographic locations. Some versions include direct linkages to online consumer health information that is relevant to the health conditions and treatments related to a specific patient.Preventive Health Services: Services designed for HEALTH PROMOTION and prevention of disease.Reproductive Health: The physical condition of human reproductive systems.Prevalence: The total number of cases of a given disease in a specified population at a designated time. It is differentiated from INCIDENCE, which refers to the number of new cases in the population at a given time.War: Hostile conflict between organized groups of people.Interviews as Topic: Conversations with an individual or individuals held in order to obtain information about their background and other personal biographical data, their attitudes and opinions, etc. It includes school admission or job interviews.Health Services Administration: The organization and administration of health services dedicated to the delivery of health care.Public Health Informatics: The systematic application of information and computer sciences to public health practice, research, and learning.National Institutes of Health (U.S.): An operating division of the US Department of Health and Human Services. It is concerned with the overall planning, promoting, and administering of programs pertaining to health and medical research. Until 1995, it was an agency of the United States PUBLIC HEALTH SERVICE.Great BritainProgram Evaluation: Studies designed to assess the efficacy of programs. They may include the evaluation of cost-effectiveness, the extent to which objectives are met, or impact.Health Plan Implementation: Those actions designed to carry out recommendations pertaining to health plans or programs.Politics: Activities concerned with governmental policies, functions, etc.Mental Disorders: Psychiatric illness or diseases manifested by breakdowns in the adaptational process expressed primarily as abnormalities of thought, feeling, and behavior producing either distress or impairment of function.Population Surveillance: Ongoing scrutiny of a population (general population, study population, target population, etc.), generally using methods distinguished by their practicability, uniformity, and frequently their rapidity, rather than by complete accuracy.Health Services for the Aged: Services for the diagnosis and treatment of diseases in the aged and the maintenance of health in the elderly.Occupational Diseases: Diseases caused by factors involved in one's employment.Quality Indicators, Health Care: Norms, criteria, standards, and other direct qualitative and quantitative measures used in determining the quality of health care.Women's Health Services: Organized services to provide health care to women. It excludes maternal care services for which MATERNAL HEALTH SERVICES is available.State Health Plans: State plans prepared by the State Health Planning and Development Agencies which are made up from plans submitted by the Health Systems Agencies and subject to review and revision by the Statewide Health Coordinating Council.Outcome and Process Assessment (Health Care): Evaluation procedures that focus on both the outcome or status (OUTCOMES ASSESSMENT) of the patient at the end of an episode of care - presence of symptoms, level of activity, and mortality; and the process (ASSESSMENT, PROCESS) - what is done for the patient diagnostically and therapeutically.Iraq War, 2003-2011: An armed intervention involving multi-national forces in the country of IRAQ.Logistic Models: Statistical models which describe the relationship between a qualitative dependent variable (that is, one which can take only certain discrete values, such as the presence or absence of a disease) and an independent variable. A common application is in epidemiology for estimating an individual's risk (probability of a disease) as a function of a given risk factor.Urban Health Services: Health services, public or private, in urban areas. The services include the promotion of health and the delivery of health care.School Health Services: Preventive health services provided for students. It excludes college or university students.Government Agencies: Administrative units of government responsible for policy making and management of governmental activities.Catchment Area (Health): A geographic area defined and served by a health program or institution.Occupational Exposure: The exposure to potentially harmful chemical, physical, or biological agents that occurs as a result of one's occupation.Reproductive Health Services: Health care services related to human REPRODUCTION and diseases of the reproductive system. Services are provided to both sexes and usually by physicians in the medical or the surgical specialties such as REPRODUCTIVE MEDICINE; ANDROLOGY; GYNECOLOGY; OBSTETRICS; and PERINATOLOGY.Health Care Coalitions: Voluntary groups of people representing diverse interests in the community such as hospitals, businesses, physicians, and insurers, with the principal objective to improve health care cost effectiveness.Health Services, Indigenous: Health care provided to specific cultural or tribal peoples which incorporates local customs, beliefs, and taboos.IraqNaval Medicine: The practice of medicine concerned with conditions affecting the health of individuals associated with the marine environment.AfghanistanHealth Records, Personal: Longitudinal patient-maintained records of individual health history and tools that allow individual control of access.Men's Health: The concept covering the physical and mental conditions of men.Health Planning Guidelines: Recommendations for directing health planning functions and policies. These may be mandated by PL93-641 and issued by the Department of Health and Human Services for use by state and local planning agencies.Poverty: A situation in which the level of living of an individual, family, or group is below the standard of the community. It is often related to a specific income level.Qualitative Research: Any type of research that employs nonnumeric information to explore individual or group characteristics, producing findings not arrived at by statistical procedures or other quantitative means. (Qualitative Inquiry: A Dictionary of Terms Thousand Oaks, CA: Sage Publications, 1997)Family Health: The health status of the family as a unit including the impact of the health of one member of the family on the family as a unit and on individual family members; also, the impact of family organization or disorganization on the health status of its members.Health Maintenance Organizations: Organized systems for providing comprehensive prepaid health care that have five basic attributes: (1) provide care in a defined geographic area; (2) provide or ensure delivery of an agreed-upon set of basic and supplemental health maintenance and treatment services; (3) provide care to a voluntarily enrolled group of persons; (4) require their enrollees to use the services of designated providers; and (5) receive reimbursement through a predetermined, fixed, periodic prepayment made by the enrollee without regard to the degree of services provided. (From Facts on File Dictionary of Health Care Management, 1988)Community Mental Health Services: Diagnostic, therapeutic and preventive mental health services provided for individuals in the community.Consumer Participation: Community or individual involvement in the decision-making process.Quality of Life: A generic concept reflecting concern with the modification and enhancement of life attributes, e.g., physical, political, moral and social environment; the overall condition of a human life.Age Factors: Age as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or the effect of a circumstance. It is used with human or animal concepts but should be differentiated from AGING, a physiological process, and TIME FACTORS which refers only to the passage of time.Health Planning Support: Financial resources provided for activities related to health planning and development.Needs Assessment: Systematic identification of a population's needs or the assessment of individuals to determine the proper level of services needed.Adolescent Health Services: Organized services to provide health care to adolescents, ages ranging from 13 through 18 years.Policy Making: The decision process by which individuals, groups or institutions establish policies pertaining to plans, programs or procedures.Schools, Public Health: Educational institutions for individuals specializing in the field of public health.Infant, Newborn: An infant during the first month after birth.Healthcare Disparities: Differences in access to or availability of medical facilities and services.Social Justice: An interactive process whereby members of a community are concerned for the equality and rights of all.Program Development: The process of formulating, improving, and expanding educational, managerial, or service-oriented work plans (excluding computer program development).Personnel Staffing and Scheduling Information Systems: Computer-based systems for use in personnel management in a facility, e.g., distribution of caregivers with relation to patient needs.United States Public Health Service: A constituent organization of the DEPARTMENT OF HEALTH AND HUMAN SERVICES concerned with protecting and improving the health of the nation.Sex Factors: Maleness or femaleness as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or effect of a circumstance. It is used with human or animal concepts but should be differentiated from SEX CHARACTERISTICS, anatomical or physiological manifestations of sex, and from SEX DISTRIBUTION, the number of males and females in given circumstances.Disaster Planning: Procedures outlined for the care of casualties and the maintenance of services in disasters.Personnel Delegation: To entrust to the care or management of another, to transfer or to assign tasks within an organizational or administrative unit or structureCohort Studies: Studies in which subsets of a defined population are identified. These groups may or may not be exposed to factors hypothesized to influence the probability of the occurrence of a particular disease or other outcome. Cohorts are defined populations which, as a whole, are followed in an attempt to determine distinguishing subgroup characteristics.Private Sector: That distinct portion of the institutional, industrial, or economic structure of a country that is controlled or owned by non-governmental, private interests.Cooperative Behavior: The interaction of two or more persons or organizations directed toward a common goal which is mutually beneficial. An act or instance of working or acting together for a common purpose or benefit, i.e., joint action. (From Random House Dictionary Unabridged, 2d ed)Financing, Government: Federal, state, or local government organized methods of financial assistance.Occupational Health Nursing: The practice of nursing in the work environment.Comprehensive Health Care: Providing for the full range of personal health services for diagnosis, treatment, follow-up and rehabilitation of patients.Educational Status: Educational attainment or level of education of individuals.International Cooperation: The interaction of persons or groups of persons representing various nations in the pursuit of a common goal or interest.Administrative Personnel: Individuals responsible for the development of policy and supervision of the execution of plans and functional operations.United States Dept. of Health and Human Services: A cabinet department in the Executive Branch of the United States Government concerned with administering those agencies and offices having programs pertaining to health and human services.Laboratory Personnel: Professionals, technicians, and assistants staffing LABORATORIES.Disease Outbreaks: Sudden increase in the incidence of a disease. The concept includes EPIDEMICS and PANDEMICS.Stress, Psychological: Stress wherein emotional factors predominate.Time Factors: Elements of limited time intervals, contributing to particular results or situations.Costs and Cost Analysis: Absolute, comparative, or differential costs pertaining to services, institutions, resources, etc., or the analysis and study of these costs.Health Fairs: Community health education events focused on prevention of disease and promotion of health through audiovisual exhibits.Personnel Selection: The process of choosing employees for specific types of employment. The concept includes recruitment.Longitudinal Studies: Studies in which variables relating to an individual or group of individuals are assessed over a period of time.Insurance Coverage: Generally refers to the amount of protection available and the kind of loss which would be paid for under an insurance contract with an insurer. (Slee & Slee, Health Care Terms, 2d ed)Organizational Objectives: The purposes, missions, and goals of an individual organization or its units, established through administrative processes. It includes an organization's long-range plans and administrative philosophy.Health Food: A non-medical term defined by the lay public as a food that has little or no preservatives, which has not undergone major processing, enrichment or refinement and which may be grown without pesticides. (from Segen, The Dictionary of Modern Medicine, 1992)Afghan Campaign 2001-: Multinational coalition military operation initiated in October 2001 to counter terrorism and bring security to AFGHANISTAN in collaboration with Afghan forces.Chronic Disease: Diseases which have one or more of the following characteristics: they are permanent, leave residual disability, are caused by nonreversible pathological alteration, require special training of the patient for rehabilitation, or may be expected to require a long period of supervision, observation, or care. (Dictionary of Health Services Management, 2d ed)IndiaProspective Studies: Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.Health Communication: The transfer of information from experts in the medical and public health fields to patients and the public. The study and use of communication strategies to inform and influence individual and community decisions that enhance health.Cost-Benefit Analysis: A method of comparing the cost of a program with its expected benefits in dollars (or other currency). The benefit-to-cost ratio is a measure of total return expected per unit of money spent. This analysis generally excludes consideration of factors that are not measured ultimately in economic terms. Cost effectiveness compares alternative ways to achieve a specific set of results.Marketing of Health Services: Application of marketing principles and techniques to maximize the use of health care resources.Social Class: A stratum of people with similar position and prestige; includes social stratification. Social class is measured by criteria such as education, occupation, and income.Interinstitutional Relations: The interactions between representatives of institutions, agencies, or organizations.Organizational Policy: A course or method of action selected, usually by an organization, institution, university, society, etc., from among alternatives to guide and determine present and future decisions and positions on matters of public interest or social concern. It does not include internal policy relating to organization and administration within the corporate body, for which ORGANIZATION AND ADMINISTRATION is available.Nurses: Professionals qualified by graduation from an accredited school of nursing and by passage of a national licensing examination to practice nursing. They provide services to patients requiring assistance in recovering or maintaining their physical or mental health.Insurance, Health, Reimbursement: Payment by a third-party payer in a sum equal to the amount expended by a health care provider or facility for health services rendered to an insured or program beneficiary. (From Facts on File Dictionary of Health Care Management, 1988)Federal Government: The level of governmental organization and function at the national or country-wide level.Ambulances: A vehicle equipped for transporting patients in need of emergency care.Emergency Medical Services: Services specifically designed, staffed, and equipped for the emergency care of patients.Efficiency, Organizational: The capacity of an organization, institution, or business to produce desired results with a minimum expenditure of energy, time, money, personnel, materiel, etc.Research Personnel: Those individuals engaged in research.Smoking: Inhaling and exhaling the smoke of burning TOBACCO.History, 20th Century: Time period from 1901 through 2000 of the common era.Urban Population: The inhabitants of a city or town, including metropolitan areas and suburban areas.Organizational Case Studies: Descriptions and evaluations of specific health care organizations.Residence Characteristics: Elements of residence that characterize a population. They are applicable in determining need for and utilization of health services.Dental Health Services: Services designed to promote, maintain, or restore dental health.Social Support: Support systems that provide assistance and encouragement to individuals with physical or emotional disabilities in order that they may better cope. Informal social support is usually provided by friends, relatives, or peers, while formal assistance is provided by churches, groups, etc.Public Sector: The area of a nation's economy that is tax-supported and under government control.Prepaid Health Plans: Contracts between an insurer and a subscriber or a group of subscribers whereby a specified set of health benefits is provided in return for a periodic premium.Employment: The state of being engaged in an activity or service for wages or salary.Operating Rooms: Facilities equipped for performing surgery.Pilot Projects: Small-scale tests of methods and procedures to be used on a larger scale if the pilot study demonstrates that these methods and procedures can work.Environmental Exposure: The exposure to potentially harmful chemical, physical, or biological agents in the environment or to environmental factors that may include ionizing radiation, pathogenic organisms, or toxic chemicals.Health Planning Councils: Organized groups serving in advisory capacities related to health planning activities.Mass Screening: Organized periodic procedures performed on large groups of people for the purpose of detecting disease.Health Transition: Demographic and epidemiologic changes that have occurred in the last five decades in many developing countries and that are characterized by major growth in the number and proportion of middle-aged and elderly persons and in the frequency of the diseases that occur in these age groups. The health transition is the result of efforts to improve maternal and child health via primary care and outreach services and such efforts have been responsible for a decrease in the birth rate; reduced maternal mortality; improved preventive services; reduced infant mortality, and the increased life expectancy that defines the transition. (From Ann Intern Med 1992 Mar 15;116(6):499-504)Decision Making, Organizational: The process by which decisions are made in an institution or other organization.Australia: The smallest continent and an independent country, comprising six states and two territories. Its capital is Canberra.Workplace: Place or physical location of work or employment.EnglandIncidence: The number of new cases of a given disease during a given period in a specified population. It also is used for the rate at which new events occur in a defined population. It is differentiated from PREVALENCE, which refers to all cases, new or old, in the population at a given time.Regression Analysis: Procedures for finding the mathematical function which best describes the relationship between a dependent variable and one or more independent variables. In linear regression (see LINEAR MODELS) the relationship is constrained to be a straight line and LEAST-SQUARES ANALYSIS is used to determine the best fit. In logistic regression (see LOGISTIC MODELS) the dependent variable is qualitative rather than continuously variable and LIKELIHOOD FUNCTIONS are used to find the best relationship. In multiple regression, the dependent variable is considered to depend on more than a single independent variable.