Table 1 Maternal characteristics of the Chinese and Australian pregnancies

Nulliparity

308 (64.2%)

170 (34.6%)

Maternal age; median (interquartile range; range)

29 (26–36; 17–49)

35 (31–39; 17–48)

Ethnicity

Chinese

480

N/A

Caucasian

N/A

282

Asian

N/A

9

Aboriginal

N/A

85

Did not answer

N/A

116

Smoking in pregnancy

3 (1%)

66 (13.4%)

Preterm birth

63 (13.1%)¹

52 (10.6%)

Threatened abortion

1 (0.2%)

15 (3.0%)

Gestational age (GA), preterm (min – max)

28-36

21-36

<28 weeks

-

6 (1.2%)

28-32 weeks

5 (1.0%)

3 (0.6%)

33-36 weeks

58 (12.1%)

43 (8.7%)

37+ weeks

417 (86.9%)

440 (89.4%)

Stillbirth

1

8

Premature rupture of membranes (PROM)

77 (16.0%)

68 (13.8%)

Preterm PROM

27 (5.6%)

19 (3.9%)