Characteristics of the cohort included in the analysis
| N | Per cent | Median age at first admission (IQR) | Percentage in most deprived quintile* | Median number of admissions (IQR) | Median total length (days) on admission (IQR) | |
|---|---|---|---|---|---|---|
| A. Male | ||||||
| Uncomplicated diagnosis group | ||||||
| Schizophrenia | 8966 | 35 | 33.7 (24.6–50.2) | 29 | 1.0 (1.0–2.0) | 48.0 (16.0–161.0) |
| Bipolar disorder | 1680 | 7 | 41.0 (28.4–56.2) | 17 | 1.0 (1.0–2.0) | 36.0 (17.0–72.0) |
| Depression | 12 778 | 49 | 47.5 (34.2–66.0) | 23 | 1.0 (1.0–1.0) | 22.0 (7.0–53.0) |
| Neurosis | 1129 | 4 | 40.7 (29.8–58.5) | 26 | 1.0 (1.0–1.0) | 14.0 (5.0–35.0) |
| Eating disorder | 49 | <1 | 22.1 (19.0–28.8) | 33 | 1.0 (1.0–1.0) | 48.0 (12.0–89.0) |
| Personality disorder | 1221 | 5 | 30.9 (23.8–41.7) | 30 | 1.0 (1.0–1.0) | 8.0 (3.0–24.0) |
| Total uncomplicated | 25 823 | 100 | 40.9 (28.4–59.6) | 25 | 1.0 (1.0–2.0) | 28.0 (9.0–74.0) |
| Complicated (hierarchical) diagnosis group | ||||||
| Schizophrenia | 10 697 | 43 | 31.0 (23.3–44.0) | 33 | 4.0 (2.0–6.0) | 145.0 (52.0–429.0) |
| Bipolar disorder | 2159 | 9 | 42.4 (30.5–56.6) | 21 | 3.0 (2.0–5.0) | 115.0 (51.0–257.0) |
| Depression | 9421 | 38 | 40.1 (30.0–54.9) | 26 | 2.0 (1.0–4.0) | 44.0 (18.0–105.0) |
| Neurosis | 915 | 4 | 37.0 (27.4–48.1) | 24 | 2.0 (1.0–3.0) | 32.0 (14.0–71.0) |
| Eating disorder | 17 | <1 | 31.3 (23.5–48.5) | 29 | 3.0 (2.0–4.0) | 45.0 (21.0–148.0) |
| Personality disorder | 1580 | 6 | 31.3 (23.8–41.6) | 31 | 2.0 (1.0–3.0) | 21.0 (8.0–49.0) |
| Total complicated | 24 789 | 100 | 35.5 (26.0–49.9) | 28 | 3.0 (2.0–5.0) | 73.0 (26.0–214.0) |
| B. Female | ||||||
| Uncomplicated diagnosis group | ||||||
| Schizophrenia | 6999 | 21 | 53.9 (34.5–76.0) | 25 | 1.0 (1.0–2.0) | 47.0 (19.0–122.0) |
| Bipolar disorder | 2196 | 7 | 43.4 (30.5–61.0) | 18 | 1.0 (1.0–2.0) | 35.0 (17.0–74.0) |
| Depression | 20 383 | 61 | 48.5 (33.8–69.1) | 23 | 1.0 (1.0–1.0) | 28.0 (10.0–65.0) |
| Neurosis | 1946 | 6 | 48.5 (33.7–68.7) | 26 | 1.0 (1.0–1.0) | 18.0 (7.0–39.0) |
| Eating disorder | 586 | 2 | 20.7 (17.5–26.5) | 16 | 1.0 (1.0–1.0) | 49.0 (13.0–126.0) |
| Personality disorder | 1095 | 3 | 31.1 (23.0–43.5) | 27 | 1.0 (1.0–1.0) | 9.0 (3.0–25.0) |
| Total uncomplicated | 33 205 | 100 | 47.6 (32.5–69.5) | 23 | 1.0 (1.0–1.0) | 30.0 (11.0–73.0) |
| Complicated (hierarchical) diagnosis group† | ||||||
| Schizophrenia | 8230 | 30 | 40.6 (27.7–66.0) | 29 | 3.0 (2.0–6.0) | 162.0 (68.0–410.0) |
| Bipolar disorder | 3619 | 13 | 43.0 (31.2–59.8) | 22 | 3.0 (2.0–5.0) | 136.0 (60.0–313.0) |
| Depression | 13 390 | 48 | 41.1 (29.8–61.8) | 25 | 2.0 (2.0–4.0) | 64.0 (25.0–163.0) |
| Neurosis | 1136 | 4 | 42.9 (31.2–63.6) | 21 | 2.0 (1.0–3.0) | 38.0 (17.0–91.5) |
| Eating disorder | 199 | 1 | 26.2 (20.7–34.3) | 18 | 2.0 (1.0–3.0) | 35.0 (10.0–103.0) |
| Personality disorder | 1113 | 4 | 29.5 (22.5–40.3) | 28 | 2.0 (1.0–3.0) | 27.0 (10.0–60.0) |
| Total complicated | 27 687 | 100 | 40.6 (28.8–61.9) | 26 | 3.0 (2.0–5.0) | 89.0 (33.0–237.0) |
*If there had been no deprivation gradient then around 20% of cases would be in the most deprived quintile.
†For individuals with a complicated mental health diagnosis (hierarchical), the age at first admission refers to the first ‘ever’ admission event.