|  | N | MCS on entry to prison Mean (sd) | MCS three months after imprisonment Mean (sd) | Mean change in MCS | p value |
---|---|---|---|---|---|---|
Aged 30 years or more | Yes | 53 | 38.1 (15.7) | 41.5 (14.1) | 3.4 | 0.34 |
 | No | 39 | 31.9 (12.5) | 38.1 (13.9) | 6.2 |  |
Self reported ethnicity: white | Yes | 54 | 34.8 (14.5) | 40.7 (14.3) | 5.9 | 0.40 |
 | No | 35 | 35.5 (15.2) | 38.8 (13.9) | 3.3 |  |
Has children aged under 16 years | Yes | 37 | 36.7 (16.2) | 40.5 (15.6) | 3.8 | 0.55 |
 | No | 50 | 38.0 (15.0) | 42.6 (13.7) | 4.6 |  |
Left school aged 16 years or less | Yes | 55 | 32.9 (14.7) | 39.6 (14.1) | 6.6 | 0.11 |
 | No | 34 | 39.2 (14.1) | 40.9 (14.1) | 1.6 |  |
Unemployed before coming into prison | Yes | 62 | 33.4 (15.1) | 39.9 (14.3) | 6.5 | 0.052 |
 | No | 28 | 39.6 (13.2) | 39.9 (14.1) | 0.3 |  |
Has been in prison before | Yes | 40 | 33.8 (15.5) | 41.2 (13.5) | 7.4 | 0.047 |
 | No | 44 | 37.5 (13.6) | 38.9 (14.7) | 1.4 |  |
Drinks more than 3 units each day | Yes | 35 | 31.9 (15.0) | 39.3 (11.3) | 7.3 | 0.23 |
 | No | 57 | 37.5 (14.4) | 40.7 (15.7) | 3.2 |  |
Injecting drug use in week prior to imprisonment | Yes | 9 | 23.7 (11.5) | 40.1 (16.9) | 16.5 | 0.007 |
 | No | 82 | 36.6 (14.5) | 39.9 (13.9) | 3.4 |  |
Longstanding illness before prison | Yes | 73 | 32.7 (13.5) | 38.0 (14.0) | 5.4 | 0.062 |
 | No | 13 | 51.9 (9.5) | 49.5 (11.0) | -2.4 |  |