Age (years) |
34.6 ± 5.3 |
Body mass index (kg/m2) |
22.3 ± 3.6 |
|
N. (%) |
Ethnicity
White
Asian
Black
|
152 (91.6)
9 (5.4)
5 (3.0)
|
Nulliparous |
97 (58.4) |
Parous |
69 (41.6) |
History of preterm birth |
23 (13.9) |
Singleton pregnancy
Multiple pregnancy:
Twin pregnancies
Triplet pregnancies
|
118 (71%)
48 (28.9)
43 (25.9)
5 (3.0)
|
Spontaneous preterm birth <34 weeks in the index pregnancy:
Singleton pregnancy
Twin pregnancies
Triplet pregnancies
|
26/118 (22.0%)
16/43 (37.2%)
4/5 (80.0%)
|