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Table 1 Baseline characteristics of the cohort and comparisons with all births in the study region (with gestational 28 weeks or more)

From: Socioeconomic disparities in prepregnancy BMI and impact on maternal and neonatal outcomes and postpartum weight retention: the EFHL longitudinal birth cohort study

Characteristics Frequency (percentagea)  
Birth cohort sample (Years 2007 to 2010) 2254 women 2277 babies Deliveries in regionb(Years 2007 to 2010) 36620 women 37061 babies p-valuec(two-sided)
Maternal age    
  < 20 years 107 (4.8%) 2559 (7.0%) < 0.001
  20-24 years 438 (19.9%) 6407 (17.6%)  
  25-29 years 632 (28.6%) 10376 (28.5%)  
  30-34 years 560 (25.4%) 10088 (27.7%)  
  ≥ 35 years 469 (21.3%) 6980 (19.2%)  
  Missing data 48 0  
Gender of infant    
  Male 1127 (50.3%) 18914 (51.3%) 0.324
  Female 1115 (49.7%) 17926 (48.7%)  
  Missing data 35 0  
Birthweight    
  < 2500 g 55 (2.5%) 1800 (4.9%) < 0.001
  2500-3999 g 1809 (81.5%) 30207 (82.0%)  
  ≥ 4000 g 355 (16.0%) 4831 (13.1%)  
  Missing data 58 2  
Gestational age at birth    
 28-36 weeks 79 (3.5%) 2376 (6.4%) < 0.001
  37-41 weeks 2131 (95.9%) 34264 (93.0%)  
  42 weeks 13 (0.6%) 200 (0.5%)  
  Missing data 54 0  
Plurality    
  Singleton 2207 (98.0%) 35980 (97.7%)  
  Multiple 46 (2.0%) 860 (2.3%) 0.370
  Missing data 24 0  
Outcome    
  Live birth 2273 (99.8%) 36728 (99.7%)  
  Stillbirth 4 (0.2%) 112 (0.3%) 0.274
  Missing data 0 0  
  1. aPercentages are calculated based on the available (non-missing) data.
  2. bData include only deliveries with gestational 28 weeks or more; data are provided by Queensland Health and New South Wales Health for the study region (Logan, Beaudesert, Gold Coast and Tweed).
  3. cChi-square test for comparing proportions between birth cohort sample and the general population.