Mothers who breast fed | Mothers who did not breast feed | P value | ||
N=6373 (85.1%) | N=1118 (14.9%) | |||
Age, mean (SD) | 29.2 (5.8) | 27.7 (6.3) | <0.001 | |
Age categories, % | <0.001 | |||
19 or less | 4.2 | 9.3 | ||
20–34 | 76.8 | 73.1 | ||
35–39 | 14.8 | 14 | ||
40 or more | 4.3 | 3.6 | ||
Region of birth, % | <0.001 | |||
Oceania | 90.4 | 95.3 | ||
Asia/Africa/Middle East | 7 | 3.4 | ||
All else | 2.6 | 1.3 | ||
Aboriginal or Torres Strait Islander, % | 5.6 | 10.7 | <0.001 | |
Relative index of inequality, % | <0.001 | |||
First quintile (lowest SES) | 32.3 | 42.9 | ||
Second quintile | 6.2 | 6 | ||
Third quintile | 27.4 | 24.2 | ||
Fourth quintile | 13.7 | 12.4 | ||
Fifth quintile (highest SES) | 20.4 | 14.5 | ||
Body mass index, % | <0.001 | |||
Underweight | <18.5 | 2 | 3.1 | |
Normal weight | 18.5–24.9 | 42.5 | 30.5 | |
Overweight | 25.0–29.9 | 27.9 | 26.2 | |
Obese class I | 30.0–34.9 | 15.5 | 19.4 | |
Obese class II | 35.0–39.9 | 7 | 10.8 | |
Obese class III | ≥40.0 | 5.2 | 9.9 | |
Past or current smoking, % | 18.9 | 38.8 | <0.001 | |
Alcohol consumption during pregnancy (any quantity), % | 2.8 | 3.7 | 0.096 |
SES, socioeconomic status.