Adjusted ORs and 95% CIs for post-injury mortality and associated factors in patients with traumatic brain injury*
| Post-injury mortality† | p Value | Multivariate‡ | ||
| Survival (n=16 140) | Mortality (n=495) | |||
| n (%) | n (%) | aOR (95% CI) | ||
| Mental disorders | <0.0001 | |||
| No | 10 889 (97.47) | 283 (2.53) | 1.00 (reference) | |
| Yes | 5251 (96.12) | 212 (3.88) | 1.15 (0.95 to 1.40) | |
| Sex | <0.0001 | |||
| Female | 7319 (98.02) | 148 (1.98) | 1.00 (reference) | |
| Male | 8821 (96.22) | 347 (3.78) | 2.02 (1.65 to 2.47) | |
| Age (years) | <0.0001 | |||
| 20–29 | 3925 (99.27) | 29 (0.73) | 1.00 (reference) | |
| 30–39 | 2574 (98.89) | 29 (1.11) | 1.51 (0.90 to 2.54) | |
| 40–49 | 2736 (98.24) | 49 (1.76) | 2.41 (1.51 to 3.84) | |
| 50–59 | 2429 (97.35) | 66 (2.65) | 3.71 (2.37 to 5.80) | |
| 60–69 | 1753 (96.85) | 57 (3.15) | 4.37 (2.74 to 6.99) | |
| ≥70 | 2723 (91.13) | 265 (8.87) | 13.3 (8.75 to 20.2) | |
| Urbanisation | 0.2596 | |||
| Low | 5157 (97.25) | 146 (2.75) | 1.00 (reference) | |
| Moderate | 3882 (96.71) | 132 (3.29) | 1.75 (1.37 to 2.24) | |
| High | 3694 (97.29) | 103 (2.71) | 1.64 (1.26 to 2.14) | |
| Very high | 3407 (96.76) | 114 (3.24) | 1.96 (1.51 to 2.54) | |
| Low income | <0.0001 | |||
| No | 15 400 (97.20) | 444 (2.80) | 1.00 (reference) | |
| Yes | 740 (93.55) | 51 (6.45) | 2.01 (1.46 to 2.75) | |
| Coexisting medical conditions | ||||
| Stroke | 906 (92.1) | 78 (7.9) | <0.0001 | 1.39 (1.06 to 1.82) |
| Renal dialysis | 109 (79.6) | 28 (20.4) | <0.0001 | 5.62 (3.55 to 8.90) |
| Ischaemic heart disease | 1358 (93.5) | 94 (6.5) | <0.0001 | 1.06 (0.82 to 1.37) |
| Hypertension | 3532 (94.5) | 204 (5.5) | <0.0001 | 0.87 (0.70 to 1.08) |
| Diabetes | 1652 (93.5) | 114 (6.5) | <0.0001 | 1.31 (1.04 to 1.66) |
| Hyperlipidaemia | 916 (96.1) | 37 (3.9) | 0.0897 | 0.86 (0.60 to 1.22) |
| Epilepsy | 366 (96.3) | 14 (3.7) | 0.4109 | 1.14 (0.65 to 1.99) |
↵* We used the International Classification of Diseases, 9th revision, clinical modification (ICD-9-CM) to defined mental disorders (ICD-9-CM, 290-319) and traumatic brain injury (ICD-9-CM, 800-804 and 850-854).
↵† Inhospital death during admission for traumatic brain injury.
↵‡ Variables in the multivariate logistic regression included mental disorders, sex, age, urbanisation, low income, and coexisting medical conditions.
aOR, adjusted OR.