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Table 1 Demographics of the Brisbane cohort (births between 1 July 2005 and 30 June 2009)

From: Methodological challenges when estimating the effects of season and seasonal exposures on birth outcomes

  n %
Total births 114,947 100.0
Gender   
   Male 59,317 51.6
   Female 55,630 48.4
Marital status   
   Married/De facto 98,888 86.0
   Never married 14,240 12.4
   Separated/Divorced 1,788 1.6
   Not stated 31 < 0.1
Indigenous status   
   Indigenous 2,568 2.2
   Non-indigenous 112,301 97.7
   Not stated 78 0.1
Smoking   
   Non-smoker 94,283 82.0
   Smoker 19,845 17.3
   Not stated 819 0.7
Pregnancy complications   
   No complications 108,946 94.8
   Pre-eclampsia 6,001 5.2
Previous pregnancies   
   0 34,857 30.3
   1-2 55,670 48.4
   3-4 17,393 15.1
   5+ 7,027 6.1
Mother's age (years), mean (SD) 29.6 (5.8)  
Gestation length (weeks), mean (SD) 38.8 (2.3)  
  1. SD = Standard deviation