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. Author manuscript; available in PMC: 2013 Jun 24.
Published in final edited form as: Pediatrics. 2010 Aug 9;126(3):e615–e622. doi: 10.1542/peds.2010-0496

TABLE 1.

Summary Statistics and Sample Sizes for Analyses

Parameter Total
(N = 173)
Abused
(n = 84)
Comparison
(n = 89)
Minority, %a 46 39 51
SESb
 Mean ± SD 36 ± 12 35 ± 14 37 ± 11
 Range 11–44 10–47 12–43
Age at assessment (dates)
 Time 1 (1987–1989)
  Mean ± SD 11 ± 3 11 ± 3 11 ± 3
  Range 6–16 6–16 6–16
 Time 2 (1988–1991)
  Mean ± SD 12 ± 3 12 ± 3 12 ± 3
  Range 7–18 7–17 7–18
 Time 3 (1990–1992)
  Mean ± SD 13 ± 3 13 ± 3 13 ± 3
  Range 8–20 8–18 8–20
 Time 4 (1996–1998)
  Mean ± SD 18 ± 4 19 ± 4 18 ± 3
  Range 11–25 11–25 11–23
 Time 5 (1999–2001)
  Mean ± SD 20 ± 3 21 ± 3 20 ± 3
  Range 13–26 13–26 13–26
 Time 6 (2004–2006)
  Mean ± SD 24 ± 3 25 ± 4 24 ± 3
  Range 18–30 18–30 18–30
No. per developmental period
 Childhood (age 6–10) 63 32 31
 Young/midadolescence (age 11–14) 113 54 59
 Mid/late adolescence (age 15–18) 106 52 54
 Young adulthood (age 19–25) 145 65 80
 Adulthood (age 26–30) 62 27 35
No. returning for follow-up (time 4, 5, and/or 6)
   used in growth curve analyses (96%)
166 82 84
 % with all 6 time points 48 42 52
 % with only 5 time points 22 34 12
 % with only 4 time points 11 13 9
 % with only 3 time points 16 9 23
 % with only 2 time points 3 2 4
a

Defined as black (90%), Hispanic (9%), and Asian (1%).

b

Defined via Hollingshead ratings.30.