Association between duration of any or exclusive BF and total ASQ score for sibling sample (n=7055)
| Increase of score per BF month | ||
| Crude B (95% CI) | Adjusted B (95% CI)*† | |
| ASQ age (6 months (0) vs 12 months (1)) | 12.8 (11.7 to 14.0) | 12.9 (11.8 to 14.1) |
| Duration of any BF (0–6 months) | 2.57 (1.38 to 3.75) | 2.23 (1.05 to 3.41) |
| ASQ age×duration of any BF | −0.57 (−1.69 to 0.55) | −0.40 (−1.53 to 0.73) |
| Increase of score per BF month | ||
| Crude B (95% CI) | Adjusted B (95% CI)* | |
| ASQ age (6 months (0) vs 12 months (1)) | 12.9 (11.7 to 14.0) | 12.9 (11.8 to 14.1) |
| Duration of exclusive BF (0–6 months) | 1.00 (−0.15 to 2.15) | 1.14 (−0.01 to 2.28) |
| ASQ age×duration of exclusive BF | 0.65 (−0.48 to 1.77) | 0.65 (−0.48 to 1.78) |
*Adjusted for sex, gestational age, birth weight, sibling order, maternal smoking and alcohol, and home speech stimulation at 1 month.
†Adjusted further for the introduction of complementary food. Boldface represents statistical significance (p<0.05).
ASQ, Ages and Stages Questionnaires; BF, breast feeding.