Table 1.
Demographic and reoffending information for cohort members with at least one proven offence, stratified by psychiatric disorder, aged 10–31, born 1983-84 (n = 26,651)
| Psychiatric disorder (n = 3,580) | No psychiatric disorder (n = 23,071) | Total (n = 26,651)a | Group difference χ2f (ϕc) |
|
|---|---|---|---|---|
| Sex [n (%)]b | 49.38*** (.04) | |||
| Female | 1,213 (15.7%) | 6,493 (84.2%) | 7,706 (28.9%) | |
| Male | 2,367 (12.5%) | 16,578 (87.5%) | 18,945 (71.1%) | |
| Indigenous status [n (%)]b | 799.90*** (.17) | |||
| Indigenous | 1,026 (28.4%) | 2,593 (71.7%) | 3,619 (13.6%) | |
| Non-Indigenous | 2,554 (11.1%) | 20,478 (88.9%) | 23,032 (86.4%) | |
| Reoffenders [n (%)]c,d | 2,616 (73.1%) | 12,924 (56.0%) | 15,540 (58.3%) | 370.09*** (.12) |
| No reoffence | 964 (26.9%) | 10,147 (44.0%) | 11,111 (41.7%) | |
| 1-2 reoffences | 961 (26.8%) | 6,620 (28.7%) | 7,581 (28.5%) | 5.12* (.01) |
| 3-5 reoffences | 636 (17.8%) | 3,213 (13.9%) | 3,849 (14.4%) | 36.65*** (.04) |
| 6-10 reoffences | 519 (14.5%) | 1,790 (7.8%) | 2,309 (8.7%) | 176.98*** (.08) |
| > 10 reoffences | 500 (14.0%) | 1,301 (5.6%) | 1,801 (6.8%) | 339.75*** (.11) |
| Reoffence type [n (%)]c | ||||
| Violent | 735 (20.5%) | 1,958 (8.5%) | 2,693 (10.1%) | 493.57*** (.14) |
| Nonviolent | 2,157 (60.3%) | 9,308 (40.4%) | 11,465 (43.0%) | 500.18*** (.14) |
| Other minor | 2,208 (61.7%) | 10,181 (44.1%) | 12,389 (46.5%) | 382.87*** (.12) |
| Reoffence frequency by type [m (sd)]e |
t g [d, (95% CI)] |
|||
| Violent | 0.35 (0.89) | 0.14 (0.57) | 0.16 (0.63) |
13.71*** 0.34 [0.29,0.39] |
| Nonviolent | 2.98 (5.38) | 1.33 (3.00) | 1.55 (3.46) |
17.90*** 0.48 [0.44,0.53] |
| Other minor | 2.57 (3.86) | 1.34 (2.56) | 1.51 (2.80) |
18.38*** 0.44 [0.40,0.49] |
*p <.05, **p <.01, ***p <.001
aColumn is percent of total sample; bRow-wise percent; cColumn-wise percent; dSubsequent court finalisations; eSubsequent proven offences
fPearson’s chi-squared test (df = 1) with Yates’ continuity correction; ϕc = Cramer’s V effect size for chi-squared test
gIndependent samples t-test (Welch two sample test for unequal variances); d = Cohen’s d effect size with 95% confidence intervals