Standardised mortality ratios for suicide for lesion cases as a function of duration of stay in hospital
| Stay in hospital | No of cases | Observed No of years | Cumulative expected frequency | Observed frequency | Standardised mortality ratio | 95% CI |
| <1 week | 2163 | 15342 | 3.99 | 14 | 3.51 | 2.08–5.92 |
| 1–4 weeks | 4952 | 33411 | 10.41 | 38 | 3.65 | 2.66–5.02 |
| 1–3 months | 3138 | 20145 | 6.74 | 31 | 4.60 | 3.23–6.54 |
| >3 months | 1513 | 10204 | 3.30 | 16 | 4.85 | 2.97–7.92 |