Table 3 Relation between risk factors and breastfeeding duration (n = 563)
Risk factors# | Hazard ratios (95% CI) (stopping breastfeeding) | p-value | |
|---|---|---|---|
Oral contraceptives (months preceding conception) | None (reference) | 1 | |
0–3 | 1.29 (1.03, 1.61) | 0.03 | |
4–12 | 1.27 (1.02, 1.58) | 0.03 | |
Mother age at pregnancy | 20–24 years (reference) | 1 | |
< 20 years | 1.11 (0.65, 1.91) | 0.69 | |
25–29 years | 0.93 (0.78, 1.11) | 0.44 | |
≥ 30 years | 4.11 (0.56, 29.80) | 0.16 | |
Maternal education | Some college (reference) | 1 | |
≤ High school | 1.40 (1.15, 1.70) | < 0.01 | |
≥ College graduate | 0.66 (0.53, 0.83) | < 0.01 | |
Birth order | 1 | 1.08 (0.90, 1.30) | 0.38 |
≥ 2 (reference) | 1 | ||
Smoke during pregnancy | No (reference) | 1 | |
Yes | 1.36 (1.13, 1.65) | < 0.01 | |
Age at menarche | ≤ 11 years | 1.00 (0.99, 1.00) | 0.13 |
12–15 years (reference) | 1 | ||
≥ 16 years | 1.00 (1.00, 1.01) | 0.12 | |
Planned pregnancy | No (reference) | 1 | |
Yes | 1.06 (0.88, 1.29) | 0.53 | |