Table 4.
Crude and adjusted hazard ratio and confidence interval for breastfeeding cessation, in ALSPAC and SWS cohorts
| Predictor | ALSPAC | SWS | ||
|---|---|---|---|---|
| Solid food introduction | HRa (95% CI) | HRb (95% CI) | HRa (95% CI) | HRb (95% CI) |
| <4 months | 2.10 (1.8, 2.4) | 2.07 (1.8, 2.4) | 1.32 (1.1, 1.5) | 1.25 (1.1, 1.5) |
| 4–5 months | 1.52 (1.3, 1.7) | 1.51 (1.3, 1.8) | 1.15 (1.0, 1.3) | 1.15 (1.0, 1.3) |
| ≥5 months | 1 | 1 | 1 | 1 |
| Mother's age | ||||
| <25 years | 1.85 (1.7, 2.1) | 1.50 (1.3, 1.7) | 1.9 (1.5, 2.6) | 1.60 (1.2, 2.1) |
| 25 to 34 years | 1.38 (1.2, 1.5) | 1.25 (1.1, 1.4) | 1.2 (1.0, 1.4) | 1.17 (1.1, 1.4) |
| >34 years | 1 | 1 | 1 | 1 |
| Mother's qualification | ||||
| CSE/vocational | 1.46 (1.3, 1.6) | 1.3 (1.2, 1.5) | 1.43 (1.6, 1.7) | 1.53 (1.2, 1.9) |
| O level | 1.47 (1.4, 1.6) | 1.3 (1.1, 1.4) | 1.32 (1.1, 1.5) | 1.45 (1.2, 1.7) |
| A level | 1.22 (1.1, 1.3) | 1.1 (1.0, 1.3) | 1.25 (1.1, 1.4) | 1.34 (1.2, 1.5) |
| Degree | 1 | 1 | 1 | 1 |
| Mother's social class | ||||
| Partly/unskilled | 1.33 (1.2, 1.5) | 1.0 (0.9, 1.1) | 1.09 (0.9, 1.4) | 0.9 (0.6, 1) |
| Manually skilled | 1.34 (1.1, 1.6) | 1.1 (0.9, 1.3) | 1.13 (0.9, 1.4) | 0.9 (0.7, 1.3) |
| Nonmanually skilled | 1.48 (1.3, 1.6) | 0.98 (0.8, 1.2) | 1.20 (0.9, 1.6) | 0.9 (0.7, 1.1) |
| Manager/technical | 1.19 (1.1, 1.3) | 0.97 (0.8, 1.1) | 1.15 (0.9, 1.5) | 1.0 (0.8, 1.2) |
| Professional | 1 | 1 | 1 | 1 |
a
Unadjusted.
b
Mutually adjusted for all variables.
Abbreviations: ALSPAC, Avon Longitudinal Study of Parents and Children; SWS, Southampton Womans Survey; CI, confidence interval; CSE, Certificate of Secondary Education; HND, Higher National Diploma; HR, hazard ratio.