Table 5.
Prevalence of overweight, crude and adjusted odds ratios (OR) with 95% confidence intervals (CI) for overweight by duration of breastfeeding
| Duration of breastfeeding |
% Overweight (95% CI) |
Crude OR (95% CI) |
Adjusted OR* (95% CI) |
Adjusted OR† (95% CI) |
| 15-year-olds | ||||
| < 2 months | 25.0 (12.7, 43.5) | 3.1 (1.2, 8.3) | 2.2 (0.6, 7.7) | 1.0 (0.2, 5.6) |
| 2–3 months | 10.6 (5.9, 18.5) | 1.1 (0.5, 2.5) | 0.6 (0.2, 1.7) | 0.6 (0.2, 2.2) |
| 4–5 months | 9.4 (4.9, 17.5) | 1.0 (0.4, 2.3) | 0.9 (0.4, 2.3) | 1.0 (0.3, 3.3) |
| ≥ 6 months | 9.7 (6.2, 14.8) | Reference | Reference | Reference |
| p-value‡ | 0.102 | 0.359 | 0.881 | |
| p-value for trend§ | 0.107 | 0.966 | 0.688 | |
| 9-year-olds | ||||
| < 2 months | 20.9 (11.5, 35.3) | 1.5 (0.7, 3.5) | 1.5 (0.6, 3.9) | 1.2 (0.3, 4.6) |
| 2–3 months | 12.5 (7.5, 20.2) | 0.8 (0.4, 1.7) | 0.7 (0.3, 1.6) | 0.6 (0.2, 1.7) |
| 4–5 months | 17.7 (11.4, 26.6) | 1.2 (0.6, 2.5) | 1.2 (0.6, 2.6) | 0.5 (0.1, 1.5) |
| ≥ 6 months | 14.5 (10.1, 20.6) | Reference | Reference | Reference |
| p-value‡ | 0.538 | 0.501 | 0.430 | |
| p-value for trend§ | 0.673 | 0.977 | 0.745 |
*Adjusted for children's age, gender, pubertal maturation, birth weight, maternal education, maternal and paternal BMI
† + maternal age and smoking status at childbirth
‡Performed by Pearson's χ2 test in univariate analysis and Wald test in logistic regression
§Performed by introducing breastfeeding categories in the model as a continuous variable