Table 4.
Cox proportional hazards model examining associations of breast-feeding status with time to introduction to complementary foods in infants prior to age 6 months, after controlling for other variables (n 325); Kingston, Frontenac, and Lennox & Addington (KFL&A) Infant Feeding Survey, Ontario, Canada, 2008
| Independent variable | Hazard ratio | se | Lower 95 % CI | Upper 95 % CI | P>χ 2 |
|---|---|---|---|---|---|
| Mother’s age | |||||
| 15–24 years | 1·9 | 0·42 | 1·2 | 2·9 | 0·003** |
| 25–34 years | 1·2 | 0·19 | 0·9 | 1·7 | 0·18 |
| ≥35 years | – | – | – | – | – |
| Smoking during pregnancy | |||||
| Yes | 1·8 | 0·38 | 1·2 | 2·7 | 0·008** |
| No | – | – | – | – | – |
| Mother attended breast-feeding or prenatal class | |||||
| No | 1·3 | 0·16 | 1·0 | 1·6 | 0·06 |
| Yes | – | – | – | – | – |
| Parity | |||||
| 1 child | 1·3 | 0·16 | 1·0 | 1·7 | 0·04* |
| ≥2 children | – | – | – | – | – |
| Infant birth weight | |||||
| 1500–2499 g | 0·6 | 0·24 | 0·3 | 1·3 | 0·2 |
| 2500–3999 g | 0·9 | 0·15 | 0·7 | 1·2 | 0·5 |
| ≥4000 g | – | – | – | – | – |
| Breast-feeding status | |||||
| Non-breast-feeding | 2·0 | 0·26 | 1·6 | 2·6 | <0·001*** |
| Any breast-feeding | – | – | – | – | – |
– indicative of comparison group.
*P<0·05, **P<0·01, ***P<0·001.