Intervention (n = 1139) | Control (n = 1122) | Total (n = 2261) | |
---|---|---|---|
Age, years | 30.2 ± 4.4a | 30.4 ± 4.7 | 30.3 ± 4.5 |
Height, cm | 167.4 ± 6.0 | 167.2 ± 6.0 | 167.3 ± 6.0 |
Pregravid weight, kg | 68.4 ± 13.1 | 68.0 ± 13.7 | 68.2 ± 13.4 |
Pregravid BMI, kg/m2 | 24.4 ± 4.4 | 24.3 ± 4.6 | 24.4 ± 4.5 |
Pregravid BMI category, n (%) | |||
BMI 18.5–24.9 kg/m2 | 732/1139 (64.3%) | 735/1122 (65.5%) | 1467/2261 (64.9%) |
BMI 25.0–29.9 kg/m2 | 271/1139 (23.8%) | 249/1122 (22.2%) | 520/2261 (23.0%) |
BMI 30.0–40.0 kg/m2 | 136/1139 (11.9%) | 138/1122 (12.3%) | 274/2261 (12.1%) |
Gestational age at entry, weeks | 8.1 ± 2.1 | 8.4 ± 2.2 | 8.3 ± 2.2 |
Nulliparous, n (%) | 706/1139 (62.0%) | 593/1119 (53.0%) | 1299/2258 (57.5%) |
Current smoker, n (%) | 60/1061 (5.7%) | 64/1044 (6.1%) | 124/2105 (5.9%) |
Number of cigarettes per day (smokers) | 4.6 ± 3.1 | 6.2 ± 4.4 | 5.4 ± 3.9 |
Previous caesarean section | 105/1027 (10.2%) | 117/1013 (11.5%) | 222/2040 (10.9%) |
Previous preterm birth | 26/1027 (2.5%) | 30/1013 (3.0%) | 56/2040 (2.7%) |
Country of birth, n (%) | |||
Germany | 1001/1138 (88.0%) | 1001/1118 (89.5%) | 2002/2256 (88.7%) |
Other | 137/1138 (12.0%) | 117/1118 (10.5%) | 254/2256 (11.3%) |
Living with a partner | 1093/1134 (96.4%) | 1065/1118 (95.3%) | 2158/2252 (95.8%) |
Educational level | |||
None | 2/1138 (0.2%) | 4/1115 (0.4%) | 6/2253 (0.3%) |
General secondary school | 172/1138 (15.1%) | 182/1115 (16.3%) | 354/2253 (15.7%) |
Intermediate secondary school | 486/1138 (42.7%) | 466/1115 (41.8%) | 952/2253 (42.3%) |
High school/Grammar school | 478/1138 (42.0%) | 463/1115 (41.5%) | 941/2253 (41.8%) |
University degree | 297/1132 (26.2%) | 296/1105 (26.8%) | 593/2237 (26.5%) |