TABLE 1

Differences in Maternal Demographics and Home Characteristics by Mother-Infant Sleeping Arrangements

Early Independent SleepersLater Independent SleepersStill Room-Sharing at 9 moP
N = 142N = 62N = 26a
Maternal demographics
 Maternal age, y (SD)29.1 (3.9)29.8 (4.9)28.1 (6.4).25
 Prepregnancy BMI (SD)26.0 (5.5)24.7 (4.3)26.0 (7.1).28
 Race/ethnicity, N (%).001
  White, non-Hispanic135 (95)54 (87)19 (73)
  Other7 (5)8 (13)7 (27)
 Annual household income, N (%).01
  <$25 0008 (6)5 (8)5 (19)
  $25 000–$49 99913 (9)3 (5)4 (15)
  $50 000–$74 99941 (29)14 (23)9 (35)
  ≥$75 00077 (54)36 (58)5 (19)
  Don’t know or declined to answer3 (2)4 (6)3 (12)
 Education, N (%)<.001
  High school graduate or less10 (7)4 (6)4 (15)
  Some college26 (18)18 (29)14 (54)
  College graduate or higher106 (75)40 (65)8 (31)
 Married and/or living with partner, N (%)138 (97)59 (95)21 (81).004
 Returned to work ≤12 wk postpartum, N (%)72 (51)29 (48)19 (73).07
 Predominantly breastfeeding, N (%)
  At 1 mo82 (58)47 (77)14 (56).03
  At 4 mo64 (45)36 (58)11 (42).21
  At 6 mo52 (37)29 (47)6 (24).12
  At 9 mo46 (32)24 (39)7 (27).51
Home characteristics
 Single-family home, N (%)102 (72)38 (63)14 (56).20
 Number of bedrooms, N (%)<.001
  10 (0)2 (3)3 (12)
  227 (19)18 (29)8 (31)
  3+115 (81)42 (68)15 (58)
 Extended family and/or others living in home, N (%)16 (12)8 (14)10 (42).005
  • a Includes 5 infants who were not room-sharing at 4 mo.