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Table 1 Head Injury, TBI, and IQ Among Inmates without ADHD and with ADHD

From: Health-related quality of life in prisoners with attention-deficit hyperactivity disorder and head injury

  All Inmates
N = 390
n (%)
without ADHD
n = 294
n (%a)
with ADHD
n = 96
n (%b)
OR (95% CI) p
ADHD prevalence   294 (75.4c) 96 (24.6c)   
Head injury frequency
 None 110 (28.2) 90 (30.6) 20 (20.8)   
 1 64 (16.4) 57 (19.4) 7 (7.3)   
 2 to 3 82 (21.0) 61 (20.8) 21 (21.9)   
 4 to 6 63 (16.2) 39 (13.3) 24 (25.0)   
 7 to 10 43 (11.0) 32 (10.9) 11 (11.5)   
 11 or more 28 (7.2) 15 (5.1) 13 (13.5) 2.19 (1.44, 3.31)d < 0.001
Any head injury 280 (71.8) 204 (69.4) 76 (79.2) 1.68 (0.97, 2.91) 0.070
Likely TBI 169 (43.3) 116 (39.5) 53 (55.2) 1.89 (1.19, 3.01) 0.007
IQ estimate, mean [sd] 76.9 [14.4] 78.2 [13.9] 72.9 [15.3] t 3.10 (385)e 0.002
  1. aPercentage of inmates without ADHD
  2. bPercentage of inmates with ADHD
  3. cPercentage of all inmates
  4. dDerived from ordered logit model. Proportionality of odds was established using a chi-square test (p = 0.08)
  5. et distribution and degrees of freedom