Table 7 Summary statistics of participant sociodemographic characteristics, stratified by analysis inclusion
|  | Excluded N = 145 (%) | Included N = 255 n (%) | p-value |
|---|---|---|---|
Age (mean, SDa) | 36 (9) | 36 (8) | 0.496b |
Aboriginal and/or Torres Strait Islander | Â | Â | Â |
  No | 119 (82) | 215 (84) | 0.561c |
  Yes | 26 (18) | 40 (16) |  |
Born outside of Australia | Â | Â | Â |
  No | 125 (86) | 233 (91) | 0.105c |
  Yes | 20 (14) | 22 (9) |  |
Unemployed before index sentence | Â | Â | Â |
  No | 14 (10) | 33 (13) | 0.338c |
  Yes | 130 (90) | 222 (87) |  |
Completed secondary school | Â | Â | Â |
  No | 126 (87) | 204 (80) | 0.081c |
  Yes | 19 (13) | 51 (20) |  |
OATd at baseline interview | Â | Â | Â |
  No | 81 (56) | 154 (60) | 0.376c |
  Yes | 64 (44) | 101 (40) |  |
Lifetime health condition | Â | Â | Â |
  No | 49 (34) | 85 (33) | 0.925c |
  Yes | 96 (66) | 170 (67) |  |
Lifetime mental illness (N = 397) |  |  |  |
  No | 31 (22) | 42 (16) | 0.186c |
  Yes | 111 (78) | 213 (84) |  |
Main drug injected in the month prior to index imprisonment | Â | Â | Â |
  Heroin only | 21 (14) | 37 (15) | 0.188c |
  Methamphetamine only | 48 (33) | 94 (37) |  |
  Heroin and methamphetamine | 63 (43) | 87 (34) |  |
  No heroin or methamphetamine | 13 (9) | 37 (15) |  |
GHQ-12e score (mean, SDa) | 5 (3) | 5 (3) | 0.435b |