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. 2010 Jun 23;5(6):e11037. doi: 10.1371/journal.pone.0011037

Table 1. Maternal, Fetal and Pregnancy Characteristics.

Study Group (320 women) Twin pregnancies (Inline graphic) Preterm singleton pregnancies (Inline graphic) Term singleton pregnancies (Inline graphic)
Maternal age (yrs)† Inline graphic Inline graphic Inline graphic
Primiparous 3 (27%) 3 (20%) 145 (49%)
No. of ultrasound scans† Inline graphic Inline graphic Inline graphic
Scan week†: 1st scan Inline graphic Inline graphic Inline graphic
2nd scan Inline graphic Inline graphic Inline graphic
3rd scan Inline graphic Inline graphic Inline graphic
4th scan Inline graphic Inline graphic Inline graphic
Maternal morbidities: E. hypertension‡ 0 0 0
G. hypertension‡ 4 0 0
Pre-eclampsia 1 0 0
Gestational diabetes 0 0 0
Smoking (self-reported): at enrolment 2 (18%) 10 (67%) 71 (24%)
at delivery 2 (18%) 8 (53%) 66 (22%)
Gestation at delivery† Inline graphic Inline graphic Inline graphic
Fetal sex: Females 11 (50%) 10 (67%) 153 (52%)
Males 11 (50%) 5 (33%) 141 (48%)
SGA* 4 (18%) 0 (0.0%) 28 (9.5%)
Birthweight (g)† Inline graphic Inline graphic Inline graphic
†

Mean Inline graphic SD.

‡

denotes Essential hypertension and Gestational hypertension respectively.

*

Small Gestational Age (SGA) if under the 10th centile for gestational age [23].