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Table 3 Demographic characteristics in 29 twin pregnancies. Demographic characteristics of 29 twin pregnancies from 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 with twins 29
Maternal age - year
 Mean 35
 Range 22 ~ 43
Gestational age - week
 Mean 14
 Median 13
 Range 11 ~ 21
Pregnancy trimester - no. (%)
 First: 1–13 week gestation 16 (55.2)
 Second: 14–26 week gestation 13 (44.8)
 Male fetus - no. (%) 26 (48.1)
 Female fetus - no. (%) 28 (51.9)
  1. Two patients with unknown fetal sex were excluded