TABLE 2

Sleep Outcome Differences Between Infants Who Are Independently Sleeping by 4 mo Versus Those Who Are Not

Early Independent SleepersLater Independent SleepersStill Room-Sharing at 9 moEarly Independent Sleepers Versus Other GroupsPa
N = 142N = 62N = 26baOR (95% CI)
4-mo assessment
 Bedtime routine, N (%)
  Consistent bedtime routine53 (37)12 (20)8 (32)1.93 (1.05–3.53).03
  Falls asleep while feeding72 (51)41 (66)10 (40)0.76 (0.44–1.31).32
  Put to bed drowsy but awake61 (43)19 (27)7 (28)1.70 (0.96–3.03).07
  Bedtime 8 pm or earlier60 (42)18 (22)5 (20)1.93 (1.06–3.53).03
 Longest sleep stretch, min (SD)469 (139)415 (154)440 (165).02
 Night wakings, mean ± SD1.1 (1.1)1.4 (1.0)1.3 (0.8).14
 Night feedings, mean ± SD1.1 (1.1)1.4 (1.0)1.4 (1.2).02
 Fed back to sleep, N (%)78 (55)46 (74)16 (64)0.51 (0.29–0.92).02
 Sleep safety, N (%)
  Nonsupine sleep position12 (9)3 (5)4 (16)1.03 (0.39–2.72).96
  Unapproved object on sleep surface48 (34)29 (48)14 (56)0.49 (0.28–0.85).02
  Brought to parent bed overnight7 (5)9 (15)6 (24)0.24 (0.09–0.61).003
 Maternal sleep poor or very poor, N (%)11 (8)10 (17)3 (12)0.47 (0.20–1.11).09
  • a Reported P values are comparing the first column (independent sleeping by 4 mo) versus the other 2 combined, adjusted for study group by using ANOVA for continuous outcomes and logistic regression for categorical outcomes.

  • b Includes 5 infants who were not room-sharing at 4 mo.