Table 1

Sample characteristics of in-patients at each of the four secure hospitals

High secure
hospital
Medium secure
hospital 1
Medium secure
hospital 2
Low secure
hospital
Pa
Total number339698563
Schizophrenia, n (%)139 (41)53 (77)33 (39)40 (63)0.001χ2 = 38.52, d.f. = 3
Ethnicity, n (%)
    White British100 (72)41 (77)21 (64)17 (42)0.002χ2 = 15.23, d.f. = 3
    White other5 (4)0 (0)1 (3)2 (5)0.500χ2 = 2.34, d.f. = 3
    Black/Black British19 (14)3 (6)4 (12)11 (28)0.026χ2 = 9.25, d.f. = 3
    Asian/Asian British9 (6)5 (9)2 (6)3 (7)0.902χ2 = 0.58, d.f. = 3
    Mixed/other ethnicity6 (4)4 (8)5 (15)7 (18)0.024χ2 = 9.42, d.f. = 3
Age, years
    Mean (s.d.)40.0 (9.8)36.9 (8.7)36.5 (8.8)38.1 (10.3)0.100ANOVA
F(3,261) = 2.10
    Median (range)38.6 (21.9–66.3)37.2 (19.6–60.0)35.2 (21.8–58.2)35.9 (19.8–62.0)
Length of stay, years
    Mean (s.d.)6.4 (4.5)2.1 (1.9)1.9 (1.4)3.0 (3.9)0.001ANOVA
F(3,261) = 26.86
    Median (range)5.9 (0.1–21.4)1.5 (0.1–8.0)1.4 (0.03–5.6)1.5 (0.03–18.2)
Female patients, n (%)b5 (3.6)0 (0)1 (3.0)4 (10.0)0.093χ2 = 0.58, d.f. = 3
    Age, years: mean (s.d.)43.1 (5.9)41.7 (13.4)0.373ANOVA F(2,7) = 1.14
    Age, years: median (range)41.1 (36.9–54.3)39.7 (25.7–62.0)
Length of stay, years:
mean (s.d.)
4.9 (2.4)1.1 (0.4)0.053ANOVA F(2,7) = 4.62
Length of stay, years:
median (range)
6.5 (1.3–6.8)1.1 (0.5–1.6)
  • a. Bold denotes significance (P ⩽ 0.05).

  • b. As medium secure hospital 2 had only 1 female in-patient, means and medians for age and length of stay have not been calculated.