Logistic regression models for potentially preventable unplanned admissions to hospital
| Covariate | Unadjusted OR (95% CI) | p value* | Adjusted OR† (95% CI) | p value* |
|---|---|---|---|---|
| Male sex | 0.96 (0.88–1.05) | 0.4 | 1.26 (1.15–1.38) | < 0.001 |
| Age, yr | < 0.001 | < 0.001 | ||
| 20–34 | 0.77 (0.63–0.95) | 1.34 (1.09–1.67) | ||
| 35–44 | 0.77 (0.62–0.95) | 1.07 (0.87–1.33) | ||
| 45–54 | 1.00 (ref) | 1.00 (ref) | ||
| 55–64 | 1.81 (1.51–2.16) | 1.22 (1.01–1.46) | ||
| 65–74 | 3.44 (2.90–4.08) | 1.56 (1.30–1.87) | ||
| ≥ 75 | 7.28 (6.22–8.53) | 2.39 (2.01–2.84) | ||
| Deprivation quintile | < 0.001 | < 0.001 | ||
| 1 (least deprived) | 1.00 (ref) | 1.00 (ref) | ||
| 2 | 1.59 (1.32–1.90) | 1.33 (1.10–1.61) | ||
| 3 | 1.96 (1.66–2.32) | 1.62 (1.35–1.94) | ||
| 4 | 2.21 (1.87–2.63) | 1.63 (1.34–1.97) | ||
| 5 (most deprived) | 2.84 (2.40–3.37) | 1.98 (1.63–2.41) | ||
| No. of physical conditions | < 0.001 | < 0.001 | ||
| 0 | 1.00 (ref) | 1.00 (ref) | ||
| 1 | 2.68 (2.22–3.22) | 2.50 (2.07–3.03) | ||
| 2 | 5.94 (4.97–7.10) | 4.93 (4.06–5.99) | ||
| 3 | 9.48 (7.91–11.37) | 6.82 (5.55–8.37) | ||
| ≥ 4 | 23.93 (20.49–27.93) | 14.38 (11.87–17.43) | ||
| Mental health condition | 2.65 (2.43–2.90) | < 0.001 | 1.80 (1.64–1.97) | < 0.001 |
Note: CI = confidence inteval, OR = odds ratio, ref = reference.
↵* p values based on joint tests, which test the overall differences between the individual categories of a given variable.
↵† Adjusted for other variables listed in the table. The adjusted model includes a random effect for practice. Intraclass correlation coefficient for practice variation, 0.019. OR for 95% midrange of practice variation (i.e., 2.5 and 97.5 percentiles, compared with average practice), 0.61–1.63.