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  • The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2458/10/460/prepub


Page 2

Characteristics Frequency (percentagea) P-valuec
  Birth cohort sample (Years 2006 to 2008)

n = 1565

Deliveries in regionb (Year 2006)

n = 8608

 
Gender of infant    
   Male 764 (49.9%) 4462 (51.8%) 0.079
   Female 782 (50.1%) 4145 (48.2%)  
   Missing data 19 0  
Maternal age    
   <20 years 87 (5.7%) 512 (5.9%) 0.239
   20-24 years 325 (21.1%) 1608 (18.7%)  
   25-29 years 424 (27.6%) 2388 (27.7%)  
   30-34 years 427 (27.8%) 2515 (29.2%)  
   ≥35 years 274 (17.8%) 1584 (18.4%)  
   Missing data 28 0  
Birth weight    
   <2500 g 39 (2.5%) 450 (5.5%) <0.0005
   2500-3999 g 1266 (81.7%) 7073 (82.2%)  
   ≥4000 g 244 (15.8%) 1060 (12.3%)  
   Missing data 16 2  
Gestational age at birth    
   <28 weeks 0 (0.0%) 59 (0.7%) <0.0005
   28-36 weeks 38 (2.4%) 536 (6.2%)  
   37-41 weeks 1505 (97.2%) 7963 (92.5%)  
   ≥42 weeks 6 (0.4%) 45 (0.5%)  
   Missing data 16 4  
Plurality    
   Singleton 1532 (98.5%) 8388 (97.4%) 0.016
   Multiple 24 (1.5%) 220 (2.6%)  
   Missing data 9 0  
Outcome    
   Live birth 1554 (99.9%) 8547 (99.3%) 0.007
   Stillbirth 2 (0.1%) 61 (0.7%)  
   Missing data 9 0  

  1. aPercentages are calculated based on the available (non-missing) data.
  2. bData for the study region (Logan, Gold Coast, Beaudesert, Tweed) are provided by Queensland Health and New South Wales Health.
  3. cChi-square test for comparing proportions between birth cohort sample and the general population.