Table 5 Prevalence of overweight, crude and adjusted odds ratios (OR) with 95% confidence intervals (CI) for overweight by duration of breastfeeding

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