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Table 2 Demographic characteristics in 447 pregnancies. Demographic characteristics of 447 pregnant women in 12 hospitals in Korea

From: An adaptive detection method for fetal chromosomal aneuploidy using cell-free DNA from 447 Korean women

Characteristic Value
No. of patients 447
Maternal age - year
 Mean 35
 Range 20 ~ 46
Gestational age - week
 Mean 15
 Median 16
 Range 11 ~ 22
Pregnancy trimester - no. (%)
 First: 1–13 week gestation 137 (30.6)
 Second: 14–26 week gestation 310 (69.4)
 Male fetus - no. (%) 249 (52.5)
 Female fetus - no. (%) 225 (47.5)