Model 2 patient-level demographics‡ and ORs by type of encounter (initial encounter code of self-harm versus subsequent or sequelae encounter)
| Category | Any principal diagnosis; self-harm code indicates initial encounter | Any principal diagnosis; self-harm code indicates ONLY subsequent or sequelae encounter | OR estimate (95% CI) |
| Subset (A+B) | Subset C | Subset C* | |
| N (%) | N (%) | ||
| Total | 7263 (100) | 1830 (100) | |
| Discharge year | |||
| 2017 | 4020 (55) | 987 (54) | |
| 2018 | 3243 (45) | 843 (46) | |
| Age (in years)† | |||
| <18 | 1297 (18) | 730 (40) | 2.9 (2.5 to 3.3) |
| 18–24 | 1448 (20) | 341 (18) | 1.1 (1.0 to 1.3) |
| 25–54 | 3523 (48) | 636 (35) | (referent) |
| 55+ | 995 (14) | 123 (7) | 0.9 (0.7 to 1.1) |
| Mean | 34 | 27 | |
| Median | 31 | 20 | |
| Gender | |||
| Male | 2817 (39) | 713 (39) | |
| Female | 4446 (61) | 1117 (61) | |
| Race | |||
| White | 5989 (83) | 1481 (81) | |
| Black | 671 (9) | 179 (10) | |
| Other/unknown | 603 (8) | 170 (9) | |
| Geography† | |||
| Urban county residence | 5524 (76) | 1264 (69) | (referent) |
| Rural county residence | 1739 (24) | 566 (31) | 1.4 (1.3 to 1.6) |
| Means of self-harm | |||
| Cutting† | 1215 (17) | 597 (33) | 2.6 (2.3 to 3.0) |
| Poisoning: drugs† | 5168 (71) | 899 (49) | |
| Poisoning: non-drugs† | 600 (8) | 94 (5) | |
| Other Means† | 919 (13) | 441 (24) | 2.7 (2.3 to 3.1) |
| Commodities | |||
| Mental, behavioural and neurological disorders (F00–F09, F20–F99)† | 6295 (87) | 1784 (97) | 4.3 (3.1 to 5.8) |
| Suicidal ideation (R45.851) | 1215 (17) | 316 (17) | |
| History of self-harm (Z91.5)† | 738 (10) | 325 (18) | 1.4 (1.2 to 1.6) |
| Drug related disorder (F11-F19)† | 2726 (38) | 809 (44) | 1.5 (1.4 to 1.7) |
| Alcohol related disorder (F10) | 1627 (22) | 401 (22) | |
| Chronic Disease Index† | |||
| Zero | 5608 (77) | 1466 (80) | |
| One | 1373 (19) | 326 (18) | |
| Two or more | 282 (4) | 38 (2) | |
| No of visits† | |||
| One | 6040 (83) | 1638 (90) | (referent) |
| Two | 942 (13) | 136 (7) | 0.5 (0.4 to 0.6) |
| Three or more | 281 (4) | 56 (3) | 0.7 (0.5 to 1.0) |
Some rounding error for age and race group percentages in order to total 100%. Comorbidities include list of relevant International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) codes in parentheses (all diagnoses fields reviewed). Chronic Disease Index based on Charlson Comorbidities Index.
*Compared to subset (A+B).
†Cochran-Mantel-Haenszel general association p≤0.05.
‡Based on information from first discharge during 2017–2018 period.