Age specific association between breast feeding and childhood anthropometric variables, Boyd-Orr cohort, UK
| Mean (SD) anthropometric z score | Mean difference (95% CI) in z scores (breast fed minus bottle fed) | ||||
|---|---|---|---|---|---|
| Variable* | No in subset with complete data | Breast fed | Bottle fed | Adjusted for clustering at the family level | Also adjusted for socioeconomic factors† and survey district |
| Mean differences between breast fed and bottle fed subjects were calculated using random effects regression modelling. | |||||
| *Internally age and sex standardised z scores calculated for children aged 2 years to 14 years 9 months. | |||||
| †Socioeconomic factors adjusted for were social class, number of children, birth order, and income category (all entered as categorical variables). | |||||
| Age 8 years or less | |||||
| Height | 1178 | −0.006 (0.96) | −0.07 (1.01) | 0.10 (−0.03 to 0.22) | 0.12 (−0.01 to 0.24) |
| p=0.13 | p=0.06 | ||||
| Trunk length | 1109 | 0.03 (0.99) | −0.06 (1.00) | 0.06 (−0.07 to 0.20) | −0.001 (−0.13 to 0.13) |
| p=0.37 | p=0.99 | ||||
| Leg length | 1111 | −0.04 (0.94) | −0.03 (1.04) | 0.04 (−0.09 to 0.17) | 0.11 (−0.01 to 0.23) |
| p=0.53 | p=0.08 | ||||
| Body mass index | 1172 | 0.002 (0.97) | −0.09 (1.06) | 0.07 (−0.06 to 0.20) | 0.03 (−0.11 to 0.16) |
| p=0.30 | p=0.69 | ||||
| Age over 8 years | |||||
| Height | 1037 | 0.11 (0.98) | −0.19 (0.98) | 0.25 (0.11 to 0.38) | 0.25 (0.12 to 0.38) |
| p<0.001 | p<0.001 | ||||
| Trunk length | 1026 | 0.14 (0.97) | −0.09 (0.99) | 0.17 (0.03 to 0.31) | 0.14 (0.01 to 0.28) |
| p=0.019 | p=0.04 | ||||
| Leg length | 1026 | 0.053 (1.00) | −0.21 (0.96) | 0.21 (0.07 to 0.35) | 0.24 (0.11 to 0.37) |
| p=0.003 | p<0.001 | ||||
| Body mass index | 1033 | 0.04 (0.98) | 0.01 (1.02) | −0.02 (−0.17 to 0.12) | −0.09 (−0.23 to 0.05) |
| p=0.74 | p=0.23 | ||||