• incidence
  • During the first period, which lasts until the 24th gestational week, the incidence of a longitudinal lie increases, with equal proportions of breech or cephalic presentations from this lie. (wikipedia.org)
  • During the second period, lasting from the 25th to the 35th gestational week, the incidence of cephalic presentation increases, with a proportional decrease of breech presentation. (wikipedia.org)
  • menstrual
  • A more complete listing of methods is given in following table: As a general rule, the official gestational age should be based on the actual beginning of the last menstrual period, unless any of the above methods gives an estimated date that differs more than the variability for the method, in which case the difference cannot probably be explained by that variability alone. (wikipedia.org)
  • In contrast, dates calculated from the first day of the last menstrual period (menstrual age) may have inaccuracies arising from imprecise recollection of dates, variation in the timing of ovulation, or time to conception. (hindawi.com)
  • variability
  • As such, there is considerable variability between current reference charts, and estimated gestational age can vary significantly depending on which chart is used. (hindawi.com)
  • trimester
  • The aims of this study were to determine if the normal range of TSH changes according to gestational age during the first trimester and to determine the upper limit of TSH to define subclinical hypothyroidism in pregnant women. (thyroid.org)
  • calculate
  • Because the Centers for Disease Control and Prevention's annual study on abortion statistics does not calculate the exact gestational age for abortions performed past the 20th week, there are no precise data for the number of abortions performed after viability. (wikipedia.org)
  • IUGR
  • IUGR is associated with a wide range of short- and long-term neurodevelopmental disorders white matter effects - In postpartum studies of infants, it was shown that there was a decrease of the fractal dimension of the white matter in IUGR infants at one year corrected age. (wikipedia.org)
  • grey matter effects - Grey matter was also shown to be decreased in infants with IUGR at one year corrected age. (wikipedia.org)
  • risk
  • Women having their first birth after the age of 35 years had a 40% increased risk compared to those with a first birth before the age of 20 years. (wikipedia.org)
  • days
  • Gestational age can also be estimated by calculating days from ovulation if it was estimated from related signs or ovulation tests, and adding 14 days by convention. (wikipedia.org)