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Table 1 Baseline characteristics of study participants

From: Effects of a lifestyle intervention during pregnancy to prevent excessive gestational weight gain in routine care – the cluster-randomised GeliS trial

  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%)
  1. aMean ± SD (all such values)
  2. BMI body mass index