Table 3.
Unadjusted and mutually adjusted prevalence ratio for stopping breastfeed before the age of 6 months at different ages of solid food introduction
| Predictor | ALSPAC | SWS | IFS 2010 | |||
|---|---|---|---|---|---|---|
| Crude PR (95% CI) | Adjusted PRd (95% CI) | Crude PR (95% CI) | Adjusted PRd (95% CI) | Crude PR (95% CI) | Adjusted PRd (95% CI) | |
| Solid food introduction | ||||||
| <4 months | 2.18 (1.7, 2.8) | 1.90 (1.5, 2.4) | 1.19 (1.0, 1.4) | 1.16 (1.0, 1.4) | 1.16 (1.0, 1.3) | 1.14 (1.0, 1.3) |
| 4–5 months | 1.45 (1.1, 1.9) | 1.37 (1.1, 1.8) | 1.05 (0.9, 1.2) | 1.04 (0.9, 1.2) | 1.05 (0.9, 1.2) | 1.05 (0.9, 1.2) |
| ≥5 months | 1 | 1 | 1 | 1 | 1 | 1 |
| Mother's age | ||||||
| <25 years | 1.91 (1.7, 2.2) | 1.42 (1.2, 1.6) | 1.51 (1.2, 1.9) | 1.24 (1.0, 1.6) | 1.06 (0.9, 1.3) | 0.95 (0.8, 1.1) |
| 25 to 34 years | 1.36 (1.2, 1.5) | 1.21 (1.1, 1.4) | 1.09 (0.9, 1.3) | 1.07 (0.9, 1.2) | 1.00 (0.9, 1.1) | 0.97 (0.9, 1.1) |
| >34 years | 1 | 1 | 1 | 1 | 1 | 1 |
| Mother's qualification | ||||||
| CSE/vocationala | 2.20 (1.9, 2.5) | 1.84 (1.6, 2.1) | 1.58 (1.3, 1.9) | 1.56 (1.3, 1.9) | ‐ | ‐ |
| O Levela | 2.10 (1.9, 2.3) | 1.73 (1.5, 2.0) | 1.57 (1.4, 1.8) | 1.52 (1.3, 1.8) | ||
| A Levelb | 1.58 (1.4, 1.8) | 1.41 (1.2, 1.6) | 1.33 (1.2, 1.5) | 1.31 (1.3, 1.5) | ||
| Degree/HND | 1 | 1 | 1 | 1 | ||
| Mother's social classc | 2.01 (1.6, 2.5) | 1.17 (0.9, 1.5) | 1.54 (1.1, 2.1) | 1.13 (0.8, 1.6) | 1.24 (1.0, 1.5) | 1.23 (1.0, 1.5) |
| Partly skilled/unskilled | 2.03 (1.6, 2.5) | 1.20 (0.9, 1.5) | 1.57 (1.1, 2.2) | 1.15 (0.8, 1.6) | 1.19 (1.1, 1.3) | 1.18 (1.1, 1.3) |
| Manually skilled | 2.19 (1.8, 2.7) | 1.34 (1.1, 1.6) | 1.62 (1.2, 2.2) | 1.22 (0.9, 1.7) | 1.08 (1.0, 1.2) | 1.07 (1.0, 1.2) |
| Nonmanually skilled | 1.66 (1.4, 2.0) | 1.27 (1.0, 1.5) | 1.38 (1.0, 1.8) | 1.23 (0.9, 1.7) | ||
| Managerial/technical/professional | 1 | 1 | 1 | 1 | 1 | |
Note. IFS 2010, ALSPAC, and SWS.
a
Completed by the age of 16.
b
Completed at the age of 18.
c
IFS 2010 classification: managerial/professional, intermediate occupational, routine/manual occupational, and never worked.
d
All the variables shown included in the adjusted model.
Abbreviations: ALSPAC, Avon Longitudinal Study of Parents and Children; SWS, Southampton Womans Survey; IFS 2010, Infant Feeding Survey 2010; CSE, Certificate of Secondary Education; HND, Higher National Diploma.