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Table 1 Sample characteristics of the EFHL infant cohorts 2006–2010, compared with regional and national population data

From: Environments For Healthy Living (EFHL) Griffith birth cohort study: characteristics of sample and profile of antenatal exposures

  EFHL study sample Study populationa Reference populationb P-value
Infant Characteristics N=2908 N=45,669 N=1,441,424  
Gender of infant     
Males 1448 (50.5) 23,498 (51.5) 735,479 (51.4) 0.315 (Study)
Females 1420 (49.5) 22,170 (48.5) 694,495 (48.6) 0.312 (Reference)
Missing 40 1 11,450  
Plurality     
Singleton 2850 (98.0) 44,568 (97.6) 1,395,372 (96.8) 0.173 (Study)
Multiple 58 (2.0) 1,101 (2.4) 46,052 (3.2) <0.001 (Reference)
Missing 0 0 0  
Gestational age at birth     
<28 weeks 0 (0.0) 273 (0.6) 12,881 (0.9) <0.001 (Study)
28-36 weeks 95 (3.3) 2,912 (6.4) 105,235 (7.3) <0.001 (Reference)
37-41 weeks 2734 (96.1) 42,227 (92.5) 1,308,933 (90.8)  
>41 weeks 17 (0.6) 245 (0.5) 13,761 (1.0)  
Missing 62 12 614  
Live births     
Live 2904 (99.9) 45,368 (99.3) 1,430,500 (99.2) 0.001 (Study)
Still born 4 (0.1) 301 (0.7) 10,815 (0.8) <0.001 (Reference)
Missing 0 0 109  
Birth weight     
<2500g 76 (2.7) 2,484 (5.4) 97,524 (6.8) <0.001 (Study)
2500-3999g 2319 (81.6) 37,287 (81.7) 1,170,968 (81.3) <0.001 (Reference)
>4000 448 (15.7) 5,894 (12.9) 172,169 (11.9)  
Missing 65 4 763  
  1. a Study population includes all births in the Logan, Beaudesert, Gold Coast and Northern Rivers Health Districts. Data sources: Queensland Perinatal Statistics 2006–2010; New South Wales Perinatal Statistics 2006–2010.
  2. b Reference Population includes all births in Australia 2006–2010. Data sources: National Perinatal Statistics 2006–2010.
  3. c Pearsons chi-squared.