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Table 1 Basic demographic data of each group

From: New cut-off values for screening of trisomy 21, 18 and open neural tube defects (ONTD) during the second trimester in pregnant women with advanced maternal age

Group N maternal age (years) gestational age (days) maternal weight (kg)
Non-AMA 197,101 28.41(21.54 ~ 34.43) 118.00(108.00 ~ 134.00) 54.50(43.00 ~ 74.60)
AMA 12,739 36.87(35.05 ~ 42.39) 118.00(109.00 ~ 134.00) 57.50(45.00 ~ 76.50)
z   189.464 4.883 2.261
P   < 0.001 < 0.001 < 0.001
  1. AMA advanced maternal age