TABLE 3

Sleep Outcomes at 9 mo by Timing of Independent Sleeping

Early Independent SleepersLater Independent SleepersStill Room-Sharing at 9 moP (Main Effect of Room-Sharing Category)aIndependent Sleepers Versus Room Sharers, aOR (95% CI)Pb
N = 142N = 62N = 26c
9 mo assessment
 Bedtime routine, N (%)
  Consistent bedtime routine67 (47)19 (31)8 (31).061.65 (0.68–3.99).27
  Falls asleep while feeding51 (36)26 (42)13 (50).410.59 (0.25–1.36).22
  Put to bed drowsy, but awake115 (81)42 (68)16 (62).052.16 (0.90–5.19).08
  Bedtime 8 pm or earlier93 (65)34 (55)10 (38).032.79 (1.18–6.61).02
 Longest sleep stretch, min (SD)542 (162)497 (166)442 (158).01
 Night wakings, mean ± SD1.0 (1.0)1.0 (0.9)1.4 (1.2).10
 Night feedings, mean ± SD0.5 (0.9)0.7 (0.9)0.8 (0.9).19
 Fed back to sleep, N (%)36 (25)24 (39)11 (42).100.56 (0.24–1.30).17
 Sleep safety, N (%)
  Nonsupine sleep position116 (82)51 (82)21 (84).960.86 (0.28–2.67).80
  Unapproved object on sleep surface97 (69)41 (67)14 (54).331.89 (0.82–4.37).14
  Brought to parent bed overnight13 (9)11 (18)9 (35).0040.25 (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.