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Table 1 Maternal and fetal characteristics of the twin pregnancies by chorionicity

From: Fetal growth standards for Chinese twin pregnancies

characteristic MC twins DC twins All
Mother n = 107 n = 291 n = 398
 Maternal age, yrs 28.7 ± 2.9 30.2 ± 2.6 29.8 ± 2.8
 Nulliparous 87(81.3) 269(92.4) 356(89.5)
 Height, m 1.62 ± 0.04 1.62 ± 0.04 1.62 ± 0.04
 Weight, kg 54.3 ± 7.2 56.5 ± 9.0 55.9 ± 8.6
 Conception methods
  Conceived naturally 93(86.9) 52(17.9) 145(36.4)
  Ovulation induction 2(1.9) 36(12.4) 38(9.6)
  In vitro fertilization 12(11.2) 203(69.8) 215(54.0)
 Ultrasound scans 10(8,11) 2(1,6) 5(1,8)
Fetus n = 214 n = 582 n = 796
 Gestational age at delivery, wks 35.9 ± 1.2 36.7 ± 1.1 36.5 ± 1.2
 Birthweight, g 2453.9 ± 361.6 2608.6 ± 328.4 2567.0 ± 344.3
 Sex
  Male 104(48.6) 312(53.6) 416(52.3)
  Female 110(51.4) 270(46.4) 380(47.7)