TABLE 3.
Sleep Outcomes at 9 mo by Timing of Independent Sleeping
| Early Independent Sleepers | Later Independent Sleepers | Still Room-Sharing at 9 mo | P (Main Effect of Room-Sharing Category)a | Independent Sleepers Versus Room Sharers, aOR (95% CI) | Pb | |
|---|---|---|---|---|---|---|
| N = 142 | N = 62 | N = 26c | ||||
| 9 mo assessment | ||||||
| Bedtime routine, N (%) | ||||||
| Consistent bedtime routine | 67 (47) | 19 (31) | 8 (31) | .06 | 1.65 (0.68–3.99) | .27 |
| Falls asleep while feeding | 51 (36) | 26 (42) | 13 (50) | .41 | 0.59 (0.25–1.36) | .22 |
| Put to bed drowsy, but awake | 115 (81) | 42 (68) | 16 (62) | .05 | 2.16 (0.90–5.19) | .08 |
| Bedtime 8 pm or earlier | 93 (65) | 34 (55) | 10 (38) | .03 | 2.79 (1.18–6.61) | .02 |
| Longest sleep stretch, min (SD) | 542 (162) | 497 (166) | 442 (158) | .01 | — | — |
| Night wakings, mean ± SD | 1.0 (1.0) | 1.0 (0.9) | 1.4 (1.2) | .10 | — | — |
| Night feedings, mean ± SD | 0.5 (0.9) | 0.7 (0.9) | 0.8 (0.9) | .19 | — | — |
| Fed back to sleep, N (%) | 36 (25) | 24 (39) | 11 (42) | .10 | 0.56 (0.24–1.30) | .17 |
| Sleep safety, N (%) | ||||||
| Nonsupine sleep position | 116 (82) | 51 (82) | 21 (84) | .96 | 0.86 (0.28–2.67) | .80 |
| Unapproved object on sleep surface | 97 (69) | 41 (67) | 14 (54) | .33 | 1.89 (0.82–4.37) | .14 |
| Brought to parent bed overnight | 13 (9) | 11 (18) | 9 (35) | .004 | 0.25 (0.01–0.63) | .003 |
a
P value is for main effect of room-sharing category, controlling for study group by using ANOVA for continuous outcomes and logistic regression for categorical outcomes.
b
P value is for odds ratio for early independent sleepers and later independent sleepers combined compared with room-sharers as a reference group, controlling for the study group.
c
Includes 5 infants who were not room-sharing at 4 mo.