| Odds ratio (95% CI) | |
| Number of children (per child) | 1.00 (0.78 to 1.27) |
| Breast feeding for 1–12 months vs 0 months | 0.74 (0.41 to 1.35) |
| Breast feeding for ⩾13 months vs 0 months | 0.47 (0.19 to 1.14) |
The analysis was adjusted for the other variables in the table by multivariate analysis.