Table 3.
Offending histories and sentencing outcomes
| Intellectual disability | Non-intellectual disability | Statistics, Z (P) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| N | n | %a or median/mean (s.d.)b | Rangeb | N | n | %a or median/mean (s.d.)b | Rangeb | ||
| Category of offender | |||||||||
| Violent | 66 | 37 | 56.1 | 335 | 195 | 58.2 | n.s. | ||
| Sexual | 66 | 7 | 10.6 | 335 | 16 | 4.8 | n.s. | ||
| Mixed | 66 | 12 | 18.2 | 335 | 76 | 22.7 | n.s. | ||
| Other | 66 | 5 | 7.6 | 335 | 24 | 7.2 | n.s. | ||
| Non-offender | 66 | 5 | 7.6 | 335 | 24 | 7.2 | n.s. | ||
| Severity of offending | |||||||||
| Score 0 | 58 | 20 | 34.5 | 306 | 87 | 28.4 | n.s. | ||
| Score 1 | 58 | 24 | 41.4 | 306 | 123 | 40.2 | n.s. | ||
| Score 2 | 58 | 12 | 20.7 | 306 | 65 | 21.2 | n.s. | ||
| Score 3 | 58 | 2 | 3.4 | 306 | 31 | 10.1 | n.s. | ||
| Total number of offences | 66 | 0–118 | 329 | 0–130 | n.s. | ||||
| Median (IQR) | 10.00 (20.00) | 9.00 (20.00) | |||||||
| Mean (s.d.) | 15.30 (19.84) | 15.27 (18.63) | |||||||
| Number of offences, mean (s.d.) | |||||||||
| Against the person | 65 | 5.06 (10.77) | 0–82 | 331 | 2.96 (3.34) | 0–15 | n.s. | ||
| Sex offences | 66 | 0.94 (2.27) | 0–13 | 332 | 0.91 (2.38) | 0–20 | n.s. | ||
| Property offences | 65 | 3.26 (6.17) | 0–33 | 330 | 2.77 (4.68) | 0–33 | n.s. | ||
| Theft and kindred offences | 66 | 2.94 (5.78) | 0–33 | 329 | 4.56 (8.91) | 0–75 | n.s. | ||
| Fraud and kindred offences | 66 | 0.03 (0.17) | 0–1 | 331 | 0.38 (1.96) | 0–26 | −2.32 (0.020) | ||
| Police/prison/court offences | 66 | 1.15 (4.13) | 0–26 | 332 | 0.98 (2.13) | 0–18 | n.s. | ||
| Drug offences | 66 | 0.06 (0.30) | 0–2 | 331 | 0.32 (1.09) | 0–9 | −2.23 (0.026) | ||
| Gun/offensive weapon offences | 66 | 0.12 (0.33) | 0–1 | 332 | 0.48 (1.13) | 0–10 | −2.63 (0.009) | ||
| Public order offences | 66 | 0.76 (2.27) | 0–16 | 330 | 0.64 (1.31) | 0–11 | n.s. | ||
| Vehicle/driving offences | 66 | 0.24 (0.77) | 0–4 | 331 | 0.85 (3.05) | 0–29 | n.s. | ||
| Other offences | 66 | 0.56 (2.65) | 0–18 | 332 | 0.48 (2.57) | 0–27 | n.s. | ||
| Any convictions | 66 | 61 | 92.4 | 335 | 311 | 92.8 | n.s. | ||
| Age at first conviction, mean (s.d.) | 59 | 20.29 (8.45) | 10–56 | 306 | 19.94 (8.12) | 10–55 | n.s. | ||
| Ever had a custodial sentence | 65 | 28 | 43.1 | 325 | 194 | 59.7 | −6.10 (0.014) | ||
| Age at first custodial sentence, mean (s.d.) | 28 | 19.89 (3.59) | 15–29 | 194 | 21.55 (5.12) | 14–43 | n.s. | ||
| Most severe sentence for any offence | |||||||||
| Life sentence | 58 | 3 | 5.2 | 307 | 33 | 10.7 | n.s. | ||
| Hospital order | 58 | 43 | 74.1 | 307 | 233 | 75.9 | n.s. | ||
| Prison >10 years | 58 | 0 | 0 | 307 | 5 | 1.6 | n.s. | ||
| Prison 6–9 years | 58 | 3 | 5.2 | 307 | 7 | 2.3 | n.s. | ||
| Prison 4–5 years | 58 | 1 | 1.7 | 307 | 2 | 0.7 | n.s. | ||
| Prison 1–3 years | 58 | 2 | 3.4 | 307 | 9 | 2.9 | n.s. | ||
| Prison <1 year | 58 | 0 | 0 | 307 | 4 | 1.3 | n.s. | ||
| Suspended sentence | 58 | 0 | 0 | 307 | 1 | 0.3 | n.s. | ||
| Community order | 58 | 1 | 1.7 | 307 | 2 | 0.7 | n.s. | ||
| Fine | 58 | 0 | 0 | 307 | 1 | 0.3 | n.s. | ||
| Conditional discharge | 58 | 0 | 0 | 307 | 2 | 0.7 | n.s. | ||
| Other sentence | 58 | 5 | 8.6 | 307 | 8 | 2.6 | n.s. | ||
| Any arson convictions | 66 | 17 | 25.8 | 334 | 62 | 18.6 | n.s. | ||
IQR, interquartile range; n.s., difference between groups not statistically significant at P<0.05.
a.
For categorical variables.
b.
For continuous variables unless otherwise stated.