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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