Table 1.
Study population characteristics.
| Explanatory variables | Year and study population (%)a |
||
|---|---|---|---|
| 2017–18 | 2018–19 | 2019–20 | |
| Total study population | 21,677 | 22,099 | 25,811 |
| Gender | |||
| Male | 19,977 (92.2%) | 20,295 (91.8%) | 23,570 (91.3%) |
| Female | 1699 (7.8%) | 1802 (8.1%) | 1376 (5.3%) |
| Missing | <10 (<0.05%)b | <10 (<0.05%)b | 865 (3.4%) |
| Prison category | |||
| A | 1664 (7.7%) | 1670 (7.6%) | 1838 (7.1%) |
| B | 9254 (42.7%) | 9442 (42.7%) | 11,904 (46.1%) |
| C | 6035 (27.8%) | 6204 (28.1%) | 6870 (26.7%) |
| Closed | 1720 (7.9%) | 1802 (8.2%) | 2245 (8.7%) |
| D | 2189 (10.1%) | 2189 (9.9%) | 2149 (8.3%) |
| Young Offenders Institution | 815 (3.8%) | 792 (3.6%) | 805 (3.1%) |
| Age (years) | |||
| 10–<20 | 468 (2.2%) | 436 (2.0%) | 404 (1.6%) |
| 20–<30 | 6994 (32.3%) | 7163 (32.4%) | 8064 (31.2%) |
| 30–<40 | 7051 (32.5%) | 7381 (33.4%) | 9125 (35.4%) |
| 40–<50 | 4114 (19.0%) | 4180 (18.9%) | 4948 (19.2%) |
| 50–<60 | 2107 (9.7%) | 1978 (9.0%) | 2224 (8.6%) |
| 60–<70 | 684 (3.2%) | 701 (3.2%) | 751 (2.9%) |
| 70–<80 | 213 (1.0%) | 209 (1.0%) | 238 (0.9%) |
| 80–<90 | 40 (0.2%) | 45 (0.2%) | 53 (0.2%) |
| 90–<100 | <10 (<0.05%)b | <10 (<0.05%)b | <10 (<0.05%)b |
| 100–<110 | <10 (<0.05%)b | c | c |
| Length of stay (months) | |||
| <1 | 4474 (20.6%) | 4801 (21.7%) | 6764 (26.2%) |
| 1–<6 | 8075 (37.3%) | 7742 (35.0%) | 10,802 (41.9%) |
| 6–<12 | 3672 (16.9%) | 3616 (16.4%) | 3893 (15.1%) |
| 12–<24 | 2832 (13.1%) | 3752 (17.0%) | 2600 (10.1%) |
| 24+ | 2624 (12.1%) | 2188 (9.9%) | 1752 (6.8%) |
| Ethnic group | |||
| White | 15,638 (72.1%) | 14,911 (67.5%) | 16,606 (64.3%) |
| Mixed | 431 (2.0%) | 371 (1.7%) | 409 (1.6%) |
| Asian/Asian British | 813 (3.8%) | 726 (3.3%) | 755 (2.9%) |
| Black/Black British | 404 (2.0%) | 364 (1.6%) | 451 (1.7%) |
| Chinese/Other | 214 (1.0%) | 167 (0.8%) | 163 (0.6%) |
| Unclassified | 372 (1.7%) | 409 (1.9%) | 387 (1.5%) |
| Missing | 3805 (17.6%) | 5151 (23.3%) | 7040 (27.3%) |
a
Percentages may not total 100 due to rounding.
b
Very small numbers suppressed (<10) to avoid disclosure.
c
No data available.