Logistic regression: relationship between day of week of birth and whether mother ever breast fed
| Unadjusted | Adjusted | |||
|---|---|---|---|---|
| Day of week of birth | Low educated | High educated | Low educated | High educated |
| Friday | ||||
| Difference in percentage breast fed (Friday vs Monday–Thursday) | 4.2 ppt. | 0.5 ppt. | −3.2 ppt. | 0.4 ppt. |
| 95% CI of difference | (−9.7 to 1.3) | (−1.6 to 2.6) | (−8.4 to 2.1) | (−1.6 to 2.4) |
| p Value | 0.134 | 0.639 | 0.233 | 0.688 |
| OR | 0.837 | 1.041 | 0.866 | 1.036 |
| 95% CI of OR | (0.666 to 1.053) | (0.879 to 1.233) | (0.684 to 1.095) | (0.871 to 1.233) |
| Saturday | ||||
| Difference in percentage breast fed (Saturday vs Monday–Thursday) | −6.6 ppt.* | −0.2 ppt. | −6.7 ppt.** | 0.3 ppt. |
| 95% CI of difference | (−12.1 to −1.1) | (−2.4 to 2.1) | (−12.1 to −1.4) | (−1.9 to 2.4) |
| p Value | 0.019 | 0.877 | 0.014 | 0.805 |
| OR | 0.759 | 0.986 | 0.742 | 1.023 |
| 95% CI of OR | (0.605 to 0.953) | (0.827 to 1.176) | (0.587 to 0.938) | (0.854 to 1.225) |
| Sunday | ||||
| Difference in percentage breast fed (Sunday vs Monday–Thursday) | 3.9 ppt. | −0.3 ppt. | 3.8 ppt. | 0.1 ppt. |
| 95% CI of difference | (−1.2 to 8.9) | (−2.4 to 1.9) | (−1.1 to 8.9) | (−2.0 to 2.1) |
| p Value | 0.136 | 0.788 | 0.131 | 0.940 |
| OR | 1.187 | 0.977 | 1.197 | 1.007 |
| 95% CI of OR | (0.944 to 1.493) | (0.824 to 1.158) | (0.944 to 1.516) | (0.846 to 1.198) |
| Observations | 3814 | 12 694 | 3814 | 12 694 |
Data from 2005 and 2010 pooled. All statistical inferences control for year of survey, type of delivery (normal vs other), maternal age in categories (under 20, 20–24, 25–29, 30–34, 35 or over), country (Wales vs England) and ethnicity (white vs other). Effects are relative to Monday–Thursday (reference). ‘Low educated’ includes those who left education aged 16 or under. ‘High educated’ includes those who left education aged 17 or over. The table reports the weighted percentage of breastfed babies born on any of Friday, Saturday or Sunday (separate rows) minus the weighted percentage of breastfed babies born on Monday–Thursday, its 95% CI, p value, OR and the 95% CI of the OR. Significance levels include Bonferroni corrections.
*p<0.1/3=0.0333; **p<0.05/3=0.0167.
ppt., percentage points.