TABLE 2

Baseline Characteristics According to Follow-up Status (ie, Retained or Lost to Kids Sleep Study) at Age 6 Years

Baseline Characteristics (4 mo)Total (N = 326)Intervention (n = 173)Control (n = 153)
Retained (n =225)Lost (n = 101)Retained (n = 122)Lost (n = 51)Retained (n = 103)Lost (n = 50)
Child
 Male54.753.550.852.959.254.0
 Age (months), mean (SD)4.6 (0.6)4.6 (0.6)4.6 (0.5)4.7 (0.6)4.5 (0.7)4.5 (0.7)
 Difficult temperament24.427.723.021.626.234.0
Mother
 Age (years), mean (SD)33.1 (4.4)32.9 (4.9)32.6 (4.2)33.4 (4.5)33.6 (4.6)32.3 (5.1)
 Depression (EPDS), mean (SD)8.5 (5.1)8.2 (5.3)8.4 (5.1)8.3 (5.6)8.5 (5.2)8.2 (5.0)
 Depression (EPDS) >939.639.636.141.243.738.0
 Education status
  Did not complete high school15.621.815.619.615.524.0
  Completed high school30.235.630.331.430.140.0
  University degree54.242.654.149.054.436.0
Family
 Index of Social Disadvantage
  High disadvantage15.124.813.913.716.536.0
  Medium disadvantage33.326.736.933.329.120.0
  Low disadvantage51.648.549.252.954.444.0
 Language other than English16.026.014.825.517.526.5
  • All values are percentages, except where otherwise stated. EPDS, Edinburgh Postnatal Depression Scale, where EPDS >9 is the community cut point for depression; SEIFA, Socioeconomic Indexes for Areas, 2002 Australian census data for socioeconomic status by postal code.