Table 1. Baseline Characteristics of the Study Population and Contact With Mental Health Services Within 30 Days From the Index Offense Date by Sex.
| Characteristic | Offender groupa | P value | ||
|---|---|---|---|---|
| All (n = 7030) | Male (n = 4933) | Female (n = 2097) | ||
| Age at the index offense, y | ||||
| Mean (SD) | 35.17 (11.59) | 35.18 (11.50) | 35.14 (11.82) | .92 |
| Median (IQR) | 34 (26-42) | 34 (27-42) | 34 (27-43) | |
| Age group at index offense, y | ||||
| <18 | 192 (2.7) | 105 (2.1) | 87 (4.1) | <.001 |
| 18-25 | 1347 (19.2) | 964 (19.5) | 383 (18.3) | |
| 26-35 | 2323 (33.0) | 1660 (33.7) | 663 (31.6) | |
| 36-45 | 1918 (27.3) | 1329 (26.9) | 589 (28.1) | |
| ≥46 | 1250 (17.8) | 875 (17.7) | 375 (17.9) | |
| Indigenous status | ||||
| No | 5429 (77.2) | 3916 (79.4) | 1513 (72.2) | <.001 |
| Yes | 464 (6.6) | 262 (5.3) | 202 (9.6) | |
| Unknown | 1137 (16.2) | 755 (15.3) | 382 (18.2) | |
| Marital status | ||||
| Married | 862 (12.3) | 506 (10.3) | 356 (17.0) | <.001 |
| Never married | 4054 (57.7) | 3012 (61.1) | 1042 (49.7) | |
| Other | 2114 (30.1) | 1415 (28.7) | 699 (33.3) | |
| Country of birth | ||||
| Other | 1109 (15.8) | 810 (16.4) | 299 (14.3) | .06 |
| Australia | 5050 (71.8) | 3525 (71.5) | 1525 (72.7) | |
| Unknown | 871 (12.4) | 598 (12.1) | 273 (13.0) | |
| SEIFA | ||||
| Advantaged (scores, 6-10) | 2750 (39.1) | 1957 (39.7) | 793 (37.8) | .15 |
| Disadvantaged (scores, 1-5) | 4280 (60.9) | 2976 (60.3) | 1304 (62.2) | |
| Type of psychosis | ||||
| Affective psychoses | 743 (10.6) | 442 (9.0) | 301 (14.4) | <.001 |
| Schizophrenia and related psychoses | 4750 (67.6) | 3442 (69.8) | 1308 (62.4) | |
| Substance-related psychoses | 1537 (21.9) | 1049 (21.3) | 488 (23.3) | |
| Type of the index offense | ||||
| Violent | 2722 (38.7) | 1908 (38.7) | 814 (39.0) | .91 |
| Nonviolent | 4308 (61.3) | 3025 (61.3) | 1283 (61.2) | |
| No. of prior offenses | ||||
| Mean (SD) | 1.31 (2.27) | 1.52 (2.41) | 0.83 (1.81) | <.001 |
| Median (IQR) | 0 (0-2) | 1 (0-2) | 0 (0-2) | |
| No. of prior offenses | ||||
| 0 | 3774 (53.7) | 2391 (48.5) | 1383 (66.0) | <.001 |
| 1-3 | 2416 (34.4) | 1836 (37.2) | 580 (27.7) | |
| ≥4 | 840 (11.9) | 706 (14.3) | 134 (6.4) | |
| Contact with mental health services within 30 d from the index offense date | ||||
| No | 4425 (62.9) | 3086 (62.6) | 1339 (63.9) | .30 |
| Yes | 2605 (37.1) | 1847 (37.4) | 758 (36.1) | |
| No. of contacts with mental health services within 30 d from the index offense date | ||||
| Mean (SD) | 1.61 (3.28) | 1.63 (3.30) | 1.56 (3.25) | .36 |
| Median (IQR) | 0 (0-2) | 0 (0-2) | 0 (0-2) | |
| No. of contacts with mental health services within 30 d from the index offense date | ||||
| 0 | 4425 (62.9) | 3086 (62.6) | 1339 (63.9) | .52 |
| 1-2 | 1150 (16.4) | 826 (16.7) | 324 (15.5) | |
| 3-4 | 570 (8.1) | 395 (8.0) | 175 (8.3) | |
| ≥5 | 885 (12.6) | 626 (12.7) | 259 (12.4) | |
Abbreviations: IQR, interquartile range; SEIFA, Socio-Economic Indices for Areas.
a
Unless otherwise indicated, data are expressed as number (percentage) of offenders. Percentages have been rounded and may not total 100.