Table 4.
Self-Harm Events by Patient and Injury Subgroups
| Variable | Rate per 1,000 person years | Rate ratio (95% CI) | |
|---|---|---|---|
| Pre-injury | Post-injury | ||
| All patients | 6.3 | 13.3 | 1.95 (1.15–3.33) |
| Sex | |||
| Male | 3.1 | 5.7 | 1.76 (0.72–4.33) |
| Female | 3.3 | 7.6 | 2.26 (1.29–3.96) |
| Age group | |||
| 16 to 44 y | 2.5 | 5.7 | 1.98 (0.76–5.16) |
| 45 to 64 y | 3.3 | 7.2 | 2.07 (1.14–3.77) |
| Older than 65 y | 0.4 | 0.4 | 1.00 (0.09–11.03) |
| Income quintile | |||
| 1 to 3 lowest | 5.0 | 9.6 | 1.72 (0.91–3.25) |
| 4 to 5 highest | 1.1 | 3.5 | 3.20 (1.13–9.05) |
| Home location | |||
| Urban | 6.1 | 10.2 | 1.78 (1.02–3.10) |
| Rural | 0.2 | 1.1 | 5.00 (0.58–42.71) |
| Comorbidity | |||
| 1 to 3 lowest | 0.7 | 2.2 | 3.33 (0.89–12.47) |
| 4 to 5 highest | 5.7 | 10.1 | 1.82 (1.03–3.22) |
| Total body surface area | |||
| <20% | 4.4 | 9.4 | 2.03 (1.07–3.85) |
| ≥20% | 2.0 | 4.0 | 1.92 (0.71–5.19) |
| Inhalation injury | 0.4 | 1.7 | 3.99 (0.82–19.48) |
| No inhalation injury | 5.9 | 11.5 | 1.74 (0.99–3.05) |
| Burn mechanism | |||
| Flame | 5.0 | 10 | 1.94 (1.08–3.46) |
| Electrical | 0 | 0 | – |
| Contact | 1.3 | 3.3 | 2.27 (0.68–7.63) |
| Index admission | |||
| Burn center | 2.8 | 6.3 | 1.86 (0.90–3.83) |
| Non-burn center | 3.5 | 7.0 | 1.97 (0.92–4.24) |