Limitations of epidemiologic methods. Medical search. Frequent questions

The journal emphasizes the application of epidemiologic methods to issues that affect the distribution and determinants of human illness in diverse contexts. (rh-konsult.se)

We review the strengths and limitations of risk of bias assessments, in particular, for reviews of observational studies of environmental exposures, and we also comment more generally on methods of evidence synthesis. (nih.gov)
Such syntheses are part of systematic reviews of observational epidemiologic study findings. (nih.gov)
Methods We identified RA patients from a large observational US cohort (2/1/2000-8/7/2011) who had discontinued at least one anti-TNF and initiated either ABA or a subsequent anti-TNF. (bmj.com)
This approach minimizes two major concerns with other observational epidemiologic study designs, confounding and reverse causation. (cdc.gov)

Below we summarize a systematic review and an epidemiologic and environmental investigation exploring the possibility of transmission from fecal sources. (cdc.gov)
Epidemiologic research is often devoted to etiologic investigation, and so techniques that may facilitate mechanistic inferences are attractive. (biomedcentral.com)
A large portion of epidemiologic research is devoted to etiologic investigation, and so techniques that may facilitate mechanistic inferences are sought by researchers and are applied frequently in their work. (biomedcentral.com)
Sometimes an epidemiologic study has previously been done for a community where a site is under investigation. (cdc.gov)
identify problems to be studied by analytic methods and suggest areas that may be fruitful for investigation Source: Adapted from Friis RH,Sellers TA. (rh-konsult.se)
It is recommended that data analysts be familiar with current practice and issues in the epidemiologic investigation of respiratory disease. (cdc.gov)

To determine the effect of changing public health surveillance methods on the reported epidemiology of Lyme disease, we analyzed Connecticut data for 1996-2007. (cdc.gov)
He has further served as an editor for statistical and epidemiologic journals and books including the Dictionary of Epidemiology sponsored by the International Epidemiological Association. (wikipedia.org)
Annals of Epidemiology is a peer reviewed, international journal devoted to epidemiologic research and methodological development. (rh-konsult.se)
ideas, theories, principles and methods of epidemiology. (rh-konsult.se)
The Department of Epidemiology has a long tradition of teaching and research in the epidemiology of cancer, cardiovascular disease, and other chronic diseases, as well as in epidemiologic methodology. (rh-konsult.se)

They use explicit, systematic methods that are selected with a view aimed at minimizing bias, to produce more reliable findings to inform decision making" ( https://www.cochranelibrary.com/about/about-cochrane-reviews ). (nih.gov)

Use of multiple surveillance methods provided a more complete clinical and demographic description of cases but lacked efficiency. (cdc.gov)
Epidemiologic data on and clinical characteristics of monkeypox (mpox) in transgender and gender-diverse persons are limited. (cdc.gov)
However, data on the epidemiologic and clinical features of Monkeypox virus infections in this population are limited ( 5 ). (cdc.gov)
With new pathogens there is an inevitable lag before methods are installed and reporting by clinical and food laboratories becomes routine. (fda.gov)
The proposed study will incorporate improved methods for exposure measurement and clinical and biologic markers to evaluate potential gene-environment interaction. (cancer.gov)

The Caregiver Burden Inventory (CBI) and the Center for Epidemiologic Studies Depression (CES-D) scale were incorporated into a self-developed questionnaire to gather demographic information on the following four aspects: general, work, income, and family. (biomedcentral.com)
Internationally-derived, evidence-based intervention effectiveness were modeled to Israeli epidemiologic, economic and demographic conditions. (who.int)

Methodologic limitations of the studies investigating the preoperative psychosocial status of breast augmentation candidates make it difficult to draw firm conclusions about the potential psychological differences between these women and those not interested in breast augmentation. (nih.gov)
It is a remarkable example in that the analytic strategy is exceedingly common, and yet is described infrequently in epidemiologic texts or methodologic articles. (biomedcentral.com)

Background: Methodological limitations of previous studies of psychosocial and work organizational risk factors and musculoskeletal outcomes have produced inconsistent associations. (cdc.gov)
Associations between exposure measures and musculoskeletal outcomes were estimated with proportional hazard methods. (cdc.gov)
Like other epidemiologic methods, Mendelian randomization has its own limitations such as a lack of genetic variants as proxies of the modifiable exposure, confounding due to population stratification, and variable effects of genetic variants on outcomes. (cdc.gov)
Although reinfections with SARS-CoV-2 have occurred in the United States with increasing frequency, U.S. epidemiologic trends in reinfections and associated severe outcomes have not been characterized. (cdc.gov)
Although an epidemiologic study can provide an important source of information when evaluating health outcomes in a community, the health assessor needs to consider the appropriateness of the study for this use. (cdc.gov)
Many epidemiologic research questions involve comparisons across groups, where associations between exposures and outcomes are likely confounded by other variables due to a lack of randomization of exposures in the study design. (byu.edu)
The impact of oral health problems on society is defined as the outcomes related to the limitations of functional capabilities and performance of expected roles. (bvsalud.org)

Method: In this prospective epidemiologic study of 386 workers, questionnaires to assess decision latitude ("control") and psychological job demands ("demand") were administered to study participants and were used to classify them into job strain "quadrants. (cdc.gov)
Methods: This study was nested in an ongoing population-based cohort, COVICAT, the GCAT-Genom. (researchgate.net)
The type of epidemiologic study most helpful to a health assessor evaluating conditions at a site is a scientific study designed to determine a possible association between contact with a specific chemical and the occurrence of a specific illness. (cdc.gov)
How does a health assessor decide whether an available epidemiologic study should be included in the health outcome data evaluation? (cdc.gov)
Data analysis should be informed by an understanding of the epidemiologic study design and data collection methods that gave rise to the data, and limitations of the data such as missingness, information bias, and selection bias. (byu.edu)
The Global Burden of Disease (GBD) Study in IHME calculates disease burdens of countries by gender, age, and illness through "estimation" based on published papers and other estimation methods for meta-regression [5]. (researchsquare.com)
This paper describes the development of a reference method to validate the wristband's estimation of daily nutritional intake of 25 free-living study participants and to evaluate the accuracy (kcal/day) and practical utility of the technology. (jmir.org)
METHODS: We conducted a retrospective cohort study using WGS from 155 genomically defined drug-resistant M. tuberculosis (DR-TB) isolates collected between 2018-2021 in Victoria, Australia. (bvsalud.org)
Study design: Different study designs have different strengths and limitations, and it is important to consider the type of study when evaluating the results. (medigy.com)
Statistical analysis: The statistical methods used to analyze the data should be appropriate for the study design and the research question being addressed. (medigy.com)
The purpose of the study was to discuss about new and ongoing epidemiologic transition, the so called "Corona and Misery" phenomenon and some of its aspects for population changes and epidemiologic transition particularly in domain of Cardiovascular Diseases (CVD). (jimc.ir)
METHODS: Participants were 3714 adults aged 50 years or more who were enrolled in the nationally representative Health and Retirement Study and had self-reported antidepressant use. (va.gov)
This study investigates the validity and accuracy of national and international diagnostic codes for HD in multiple HIS and analyses the epidemiologic trends of HD in the Autonomous Community of Navarre (Spain). (biomedcentral.com)
This study aimed to evaluate the prevalence of HB and HC in the Prospective Epidemiological Research Studies of the Iranian Adults (PERSIAN) Guilan Cohort Study through immunological and molecular methods. (researchsquare.com)
Methods: Panel data from 8291 participants in the English Longitudinal Study of Ageing were analysed. (kcl.ac.uk)
The proposed study will overcome these limitations, including the incorporation of improved methods for occupational data collection and exposure assessment. (cancer.gov)

Evidence synthesis (or evidence integration) is widely used to summarize findings of epidemiologic studies of environmental and occupational exposures. (nih.gov)
There are several characteristics of epidemiologic studies that are important to consider when evaluating their findings. (medigy.com)
The objective of this review is to systematically review the findings of existing epidemiologic research on vitamin C and its potential role in cardiovascular disease (CVD). (mdpi.com)

His focus has been the extensions, limitations, and misuses of statistical methods in nonexperimental studies, especially in postmarketing surveillance of drugs, vaccines, and medical devices. (wikipedia.org)
Due to limits of epidemiologic and statistical methods, many investigations of unusual patterns of cancer will be unable to establish a relationship between a specific environmental exposure and a health outcome (10), and in some cases, there may be no relationship. (cdc.gov)

Increasingly, risk of bias tools are used to evaluate epidemiologic studies as part of evidence synthesis (evidence integration), often involving meta-analyses. (nih.gov)
The two-source capture-recapture method 5 was used to estimate the incidence of CRS and to evaluate the sensitivity of case ascertainment by the NNDSS. (who.int)
Epidemiologic studies evaluate the occurrence of illness in a population and any factors, such as lifestyle and chemical exposure, that might be associated with the occurrence of the illnesses. (cdc.gov)

Epidemiologic research questions can be translated into statistical questions that can be addressed using appropriate data and quantitative data analysis methods. (byu.edu)
Common methods include conventional radiography, quantitative CT (QCT), single-photon absorptiometry (SPA), dual-photon absorptiometry (DPA), quantitative ultrasonography (QUS), and dual-energy x-ray absorptiometry (DEXA). (medscape.com)

METHODS: We modeled the prevalence of PCC using reported infections occurring from 1 February 2020 to 30 September 2021, and population-based, household survey data on new activity-limiting symptoms 1 month following SARS-CoV-2 infection. (cdc.gov)
It means that epidemiologic parameters such as prevalence, incidence and fatality may not have measured coherently. (researchsquare.com)
Because oocysts of T. gondii are rarely found in feces of cats, serologic prevalence data in cats are important for the determination of epidemiologic significance of T. gondii infections. (vin.com)

Depressive symptoms were assessed using the 8-item Center for Epidemiologic Studies Depression Scale. (va.gov)
Depressive symptoms were assessed with the 8-item Centre for Epidemiologic Studies Depression Scale (CES-D). The AL score was derived from nine metabolic, cardiovascular and immune biomarkers. (kcl.ac.uk)

MATERIALS AND METHODS: A total of 1524 adolescent students aged 14-18 years (764 boys and 760 girls) were randomly selected. (who.int)

During 1996-2007, the Connecticut Department of Public Health (CDPH) received Lyme disease reports through 4 surveillance methods: passive physician, active physician, enhanced laboratory, and mandatory laboratory. (cdc.gov)
Public health surveillance methods for infectious diseases change over time, depending on program priorities and resources, advancements in diagnostic testing, modifications to surveillance case definitions, and changing reporting modalities (e.g., electronic laboratory reporting). (cdc.gov)
Life course data on obesity may enrich the quality of epidemiologic studies analysing health consequences of obesity. (plos.org)
Take our 10-week online geo-health course to learn how to integrate geographic information , use different g eospatial technologies and apply spatial data science methods to understand different health aspects better. (itc.nl)
Each week you will tackle a specific health or disease problem integrating the theories with spatial data and different methods. (itc.nl)
However, since they used the National Health and Nutrition Examination Survey data to measure the health loss, it has a limitation that only a narrow spectrum of diseases (45 diseases) was included in it. (researchsquare.com)
Describe the epidemiologic approach and contribution to medical and health sciences. (uaeu.ac.ae)
Describe the uses and limitations of different types of epidemiological studies and their applications to public health. (uaeu.ac.ae)
This method is endorsed by the World Health Orga-nization for population-based surveys of blindness and VI in people aged 50 years and older in a specific geograph-ic area. (aao.org)
For more detailed information and instructions on the step-by-step procedures used in investigating foodborne illness, see the Compendium of Methods for the Microbiological Examination of Foods , published by the American Public Health Association of Washington, DC, USA. (fda.gov)
Because of the rarity of the disease, most epidemiologic studies use administrative databases or health information systems (HIS) to identify HD cases. (biomedcentral.com)
Identify the principles and limitations of public health screening programs. (rh-konsult.se)
Results from the National Epidemiologic Survey conducted in Brazil in 2010 showed an overview of access to oral health services of adolescents between 15 and 19 years old. (bvsalud.org)
Physical Functioning (PFQ) contains data on functional physical limitations as well information on the type of health problems (including respiratory disease) causing the difficulty. (cdc.gov)

Data were stratified by 4 surveillance methods and compared. (cdc.gov)
Variations based on surveillance methods were seen. (cdc.gov)
When interpreting data, changes in surveillance method must be considered. (cdc.gov)
This agency, which is the principal source of epidemiologic data on reported foodborne disease outbreaks in the United States, periodically publishes summary surveillance reports of foodborne diseases in the Morbidity and Mortality Weekly Report series. (fda.gov)
Although CDC's foodborne disease surveillance system has limitations (i.e., except for illnesses linked to chemicals or toxins, sporadic cases of foodborne illness are not reported), the system does provide helpful epidemiologic insights. (fda.gov)

Sander Greenland (born January 16, 1951) is an American statistician and epidemiologist with many contributions to statistical and epidemiologic methods including Bayesian and causal inference, bias analysis, and meta-analysis. (wikipedia.org)
We apply a causal framework based on latent potential response types to describe the limitations inherent in effect decomposition analysis. (biomedcentral.com)

and c ) a method to synthesize evidence across studies (which sometimes includes a meta-analysis). (nih.gov)

Strategies to reduce transmission of Toxoplasmosis to animals and humans have to be considered regarding limitation the number of stray cats. (vin.com)
2007). However, there may be limitation using in vitro data to extrapolate to an in vivo kinetics, and also from marmosets to humans by these available data alone. (who.int)

Empirical testing of both is dominated by self-report questionnaires, which is the most widely used method in psychological assessments and sociology polls. (nih.gov)

ABSTRACT We reviewed the epidemiologic features and trends for 771 cases of meningitis in Oman from January 2000 to December 2005. (who.int)

The aim of this report is to draw attention to i) the potential distorting effect of SD and ii) the limitation of using correlation analysis between a SD measure and the individual measures. (nih.gov)
METHODS: We use stable isotope analysis of 43 human bone samples representing 14 females, 20 males, 8 juveniles, and 1 indeterminate individual recovered from burial excavations at the sites of Rio Muerto and Omo in the Moquegua Valley. (who.int)
CDC defines a foodborne disease outbreak as an incident in which at least two (or more) persons experience a similar illness after ingestion of a common food, and epidemiologic analysis implicates the food as the source of the illness. (fda.gov)

The third epidemiologic transition was transition from mortality due to chronic, noncommunicable diseases in comparison to mortality from malnutrition and infectious diseases (10). (jimc.ir)
Epidemiologic studies of myalgic encephalomyelitis/ chronic fatigue syndrome (ME/CFS) have examined different aspects of this disease separately but few have explored them together. (frontiersin.org)

A reference method was developed to validate the estimation of daily nutritional intake of participants by the wristband. (jmir.org)
A total of 304 input cases were collected of daily dietary intake of participants (kcal/day) measured by both reference and test methods. (jmir.org)

1 "RAAB is a valuable alternative in areas where cost and logistical factors prohibit the use of conventional epidemiologic surveys," said coauthor Dennis S.C. Lam, MD, FRCOphth, at the Chinese University of Hong Kong. (aao.org)

3. Recognize the value of using a Perinatal Periods of Risk approach for addressing limitations in using traditional infant mortality measures for program and policy planning efforts and working with communities to address feto-infant mortality through targeted interventions. (confex.com)

Change in cognitive function over the 6-year follow-up period was examined using linear growth models, adjusted for demographics, depressive symptoms, comorbidities, functional limitations, and antidepressant anticholinergic activity load. (va.gov)
The association between AL and depressive symptoms was modelled in a linear hybrid model adjusting for time-invariant (sex, ethnicity) and time-variant confounders (age, marital status, education, wealth, physical activity, smoking status, alcohol intake, limitations in daily living, comorbidities). (kcl.ac.uk)

Introduction to statistical concepts and analytical methods as applied to data encountered in biotechnology and biomedical sciences. (byu.edu)

The list of such untenable overgeneralizations in epidemiologic practice is surely large and varied, and has led to any number of false conclusions and misunderstandings. (biomedcentral.com)

Epidemiologic studies have suggested that consumption of cold water fish oils may have some protective function against depression. (psychiatrist.com)

A number of methods have been developed for the in vivo determination of bone density in patients at risk for osteoporosis. (medscape.com)

Inactivity and obesity was the fifth stage of epidemiologic transition (13). (jimc.ir)

The few textbook citations that do exist provide no formal justification, and therefore there is little guidance available from within the sources in our field to guide users and warn them of important limitations of this approach. (biomedcentral.com)

The major advantages of this method are its sim-plicity, rapid conduct, lower cost, and use of standardized assessments," said Dr. Lam. (aao.org)

We describe here one particular epidemiologic technique that is applied frequently in practice, and yet is invalid in all but a surprisingly narrow range of circumstances. (biomedcentral.com)

Epidemiologic studies have suggested but not proven an environmental influence. (cancer.gov)

Springer, Berlin, it has … Identify key sources of data for epidemiologic purposes. (rh-konsult.se)

Discussion of challenges at the onset of community engagement may enhance community understanding of scientific issues, including limitations upon which decisions are based (7,35). (cdc.gov)

The results of the seven epidemiologic studies that have identified a relationship between cosmetic breast augmentation and suicide are detailed. (nih.gov)
Due to many limitations and common misinterpretations of the p value, 1 the fragility index (FI) has been suggested as an easier, more intuitive way to communicate results to clinicians and other stakeholders. (bmj.com)

Typically, some method is proposed under a sound theoretical argument in a specific analytic setting, but this method is subsequently applied in a more general context in which those specific theoretical conditions no longer hold. (biomedcentral.com)

Currently, DEXA is the most accurate and recommended method for BMD measurement. (medscape.com)
Bone-density measurements can be performed by using X-ray methods, such as DEXA, QCT, and ultrasonic methods. (medscape.com)

3. Data Collection--methods--United States. (cdc.gov)

Published literature regarding epidemiologic trans- ition and cardiovascular diseases, as well as cardiovascular diseases and COVID-19, including cardiovascular changes in 2020, were reviewed. (jimc.ir)

Analytical, Diagnostic and Therapeutic Techniques and Equipment5

Disciplines and Occupations2

Humanities1

Health Care7

Geographicals1

Application of epidemiologic methods1

Observational4

Investigation6

Epidemiology5

Minimizing bias1

Clinical5

Demographic2

Methodologic2

Outcomes7

Study16

Findings3

Statistical methods2

Evaluate3

Quantitative2

Prevalence3

Scale2

Materials and Met1

Health14

Surveillance5

Causal2

Synthesize1

Humans2

Questionnaires1

Abstract1

Analysis3

Chronic2

Participants2

Conventional1

Mortality1

Comorbidities2

Concepts1

Conclusions1

Consumption1

Determination1

Obesity1

Provide1

Advantages1

Practice1

Studies have suggested1

Identify1

Issues1

Results2

Analytic1

DEXA2

Data Collection1

Literature1