Logistic regression models for unplanned admissions to hospital
| Covariate | Unadjusted OR (95% CI) | p value* | Adjusted OR† (95% CI) | p value* |
|---|---|---|---|---|
| Male sex | 0.95 (0.92–0.99) | 0.01 | 1.22 (1.17–1.27) | < 0.001 |
| Age, yr | < 0.001 | < 0.001 | ||
| 20–34 | 0.83 (0.77–0.90) | 1.15 (1.05–1.24) | ||
| 35–44 | 0.85 (0.79–0.92) | 1.03 (0.95–1.12) | ||
| 45–54 | 1.00 (ref) | 1.00 (ref) | ||
| 55–64 | 1.45 (1.34–1.56) | 1.12 (1.04–1.21) | ||
| 65–74 | 2.38 (2.22–2.56) | 1.41 (1.30–1.52) | ||
| ≥ 75 | 5.60 (5.24–5.98) | 2.59 (2.40–2.79) | ||
| Deprivation quintile | < 0.001 | < 0.001 | ||
| 1 (least deprived) | 1.00 (ref) | 1.00 (ref) | ||
| 2 | 1.29 (1.20–1.38) | 1.08 (1.00–1.18) | ||
| 3 | 1.45 (1.35–1.55) | 1.23 (1.13–1.33) | ||
| 4 | 1.68 (1.56–1.80) | 1.32 (1.21–1.43) | ||
| 5 (most deprived) | 2.07 (1.93–2.22) | 1.56 (1.43–1.70) | ||
| No. of physical conditions | < 0.001 | < 0.001 | ||
| 0 | 1.00 (ref) | 1.00 (ref) | ||
| 1 | 1.88 (1.76–2.01) | 1.70 (1.59–1.82) | ||
| 2 | 3.42 (3.20–3.65) | 2.69 (2.50–2.89) | ||
| 3 | 5.17 (4.83–5.54) | 3.47 (3.21–3.76) | ||
| ≥ 4 | 10.60 (10.01–11.23) | 5.87 (5.45–6.32) | ||
| Mental health condition | 2.58 (2.48–2.69) | < 0.001 | 2.01 (1.92–2.09) | < 0.001 |
Note: CI = confidence interval, OR = odds ratio, ref = reference.
↵* p values are 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, 0.010. OR for 95% midrange of practice variation (i.e., 2.5 and 97.5 percentiles, compared with average practice), 0.70–1.42.