Table 1 Comparison of clinical characteristics in the control twin and sIUGR twin groups.

Maternal age (years)

30.0 ± 3.5

29.0 ± 3.7

0.20^a

Employed outside the home

0.91^c

Yes

9 (60%)

13 (54.2%)

No

6 (40%)

11 (45.8%)

Body mass index (kg/m²)

21.0 ± 2.5

21.0 ± 2.8

0.94^a

Primigravida

9/15 (60%)

13/24 (54.2%)

0.98^c

Smoking during pregnancy

0/15 (0%)

0/24 (0%)

1.00

IVF-ET/natural conception

1.00^c

IVF-ET^e

1 (6.7%)

2 (8.3%)

Natural conception

14 (93.3%)

22 (91.7%)

Gestational age at delivery (wks)

35 (34, 37)

36.5 (35, 37)

0.07^d

Delivery

1.00^d

Cesarean

15 (100%)

24 (100%)

Vaginal

0 (0%)

0 (0%)

Neonatal sex

0.78^c

Male/male

9 (60%)

12 (50%)

Female/female

6 (40%)

12 (50%)