| Outcome | EPDS baseline score | Group | Adjusted comparative statistic (intervention relative to control) | p Value for interaction | |||
| Intervention | n | Control | n | ||||
| Sleep | |||||||
| Sleep problem at 10 months, n (%) | >9 | 34 (54) | 63 | 43 (72) | 60 | 0.34 (0.14, 0.81) | 0.24 |
| ⩽9 | 58 (58) | 100 | 57 (66) | 87 | 0.71 (0.38, 1.32) | ||
| Sleep problem at 12 months, n (%) | >9 | 30 (47) | 64 | 36 (62) | 58 | 0.49 (0.22, 1.07) | 0.88 |
| ⩽9 | 34 (34) | 99 | 44 (50) | 88 | 0.48 (0.26, 0.90) | ||
| EPDS score | |||||||
| Total EPDS score at 10 months, mean (SD) | >9 | 9.5 (5.6) | 63 | 11.8 (5.0) | 60 | −2.1 (−3.9, −0.2) | 0.05 |
| ⩽9 | 5.1 (4.0) | 100 | 5.1 (4.1) | 87 | −0.2 (−1.4, 0.9) | ||
| Total EPDS score at 12 months, mean (SD) | >9 | 8.9 (4.8) | 64 | 10.5 (4.6) | 58 | −1.6 (−3.2, 0.1) | 0.56 |
| ⩽9 | 4.0 (3.8) | 99 | 5.0 (4.3) | 88 | −1.3 (−2.6, 0.1) | ||
The comparative statistic is odds ratio for sleep problem and mean difference for EPDS score. EPDS, Edinburgh Postnatal Depression Scale.
All analyses adjusted for whether a mother received paid professional help for the infant’s sleep problem and level of nurse competency. The test of interaction for the sleep problem outcome was additionally adjusted for Socio-Economic Indexes For Areas (SEIFA) Index of Relative Disadvantage code and mother’s education.