Table 1

Sample characteristics

Recruited sample at age 7 monthsFollowed up at age 3 years
VariableIntervention (N=329)*Control (N=404)†Intervention (N=259)‡Control (N=330)§
Infant
 Male (%)50.252.251.051.5
 Family position (first-born) (%)56.151.157.050.6
 ‘Difficult’ temperament (%)5.26.86.36.8
Family
 Maternal age in years (mean (SD), range)33.0 (4.8)33.3 (4.7)33.3 (4.8)33.6 (4.4)
 Married/de facto (%)96.796.598.197.6
 Anglo-Australian cultural identity (%)76.779.077.079.6
 Language other than English at home (%)3.64.21.53.9
 Education status (% mothers/% fathers)
  Did not complete high school19.8/29.421.0/32.415.9/27.218.8/33.5
  Completed high school34.5/33.232.2/27.034.5/33.131.8/24.5
  Completed tertiary/postgraduate degree45.7/37.346.8/40.649.6/39.849.4/41.9
 Annual household income $A (%)
  <300009.110.55.99.7
  30000–6000032.033.231.831.9
  >6000058.956.362.358.4
 Maternal mental health (mean (SD))
  Depression4.1 (5.4)3.5 (4.5)3.8 (4.9)3.3 (4.0)
  Anxiety2.2 (3.6)1.9 (3.1)1.9 (2.9)2.0 (3.1)
  Stress9.0 (6.5)8.8 (6.3)8.8 (6.1)8.8 (6.2)
Neighbourhood
 Disadvantage (SEIFA¶) score (mean (SD))1046.4 (67.0)1042.9 (70.5)1048.4 (64.5)1044.4 (67.5)
  • Statistics reported are based on

  • * 297–329 participants;

  • 389–404 participants;

  • 236–259 participants;

  • § 320–330 participants.

  • SEIFA, Australian census-based Socio-Economic Indexes for Areas, a standardised measure that can be summarised at neighbourhood level.