Association between emergency department visits following knee or hip replacement surgery and continuity of primary care
| Variable | Probability of an ED visit within 90 d of surgery | |||
|---|---|---|---|---|
| Knee replacement surgery | Hip replacement surgery | |||
| Unadjusted OR (95% CI) | Adjusted OR (95% CI) | Unadjusted OR (95% CI) | Adjusted OR (95% CI) | |
| MMCI × 100 | 0.987* (0.985–0.990) | 0.994* (0.991–0.997) | 0.991* (0.988–0.994) | 0.994* (0.991–0.998) |
| Length of stay, d | – | 1.020* (1.012–1.027) | – | 1.002 (0.998–1.007) |
| Year of surgery | – | 1.025* (1.017–1.034) | – | 1.019* (1.007–1.030) |
| Hospital | ||||
| C | Ref. | Ref. | ||
| A | – | 1.072 (0.960–1.196) | – | 1.003 (0.870–1.158) |
| B | – | 0.662* (0.594–0.739) | – | 0.835* (0.726–0.960) |
| D | – | 1.001 (0.898–1.116) | – | 0.964 (0.814–1.142) |
| E | – | 0.921 (0.833–1.019) | – | 0.787* (0.683–0.907) |
| Age, yr | ||||
| 60–69 | Ref. | Ref. | ||
| < 50 | – | 1.386* (1.124–1.709) | – | 0.949 (0.774–1.164) |
| 50–59 | – | 1.043 (0.945–1.151) | – | 0.894 (0.778–1.028) |
| 70–84 | – | 1.099* (1.015–1.189) | – | 1.208* (1.081–1.349) |
| ≥ 85 | – | 1.439* (1.164–1.778) | – | 1.303* (1.103–1.649) |
| Female | – | 0.950 (0.886–1.019) | – | 0.879* (0.801–0.965) |
| Charlson Comorbidity Index score | – | 1.078* (1.031–1.126) | – | 1.069* (1.019–1.121) |
| Hypertension | – | 1.024 (0.954–1.099) | – | 1.017 (0.923–1.120) |
| Anemia | – | 1.131* (1.029–1.242) | – | 1.156* (1.020–1.309) |
| Median neighbourhood income | – | 1.002* (1.000–1.004) | – | 1.000 (0.998–1.002) |
| Blood transfusion | – | 1.260* (1.075–1.477) | – | 1.263* (1.074–1.487) |
| Admitted from home | – | 0.758 (0.540–1.066) | – | 0.868 (0.627–1.203) |
| Distance to hospital | – | 0.998* (0.998–0.999) | – | 0.999* (0.998–1.000) |
| ED visit 1 yr earlier | – | 2.436* (2.263–2.623) | – | 2.008* (1.817–2.220) |
Note: The full range of MMCI values is included. CI = confidence interval; ED = emergency department; MMCI = Modified Modified Continuity Index; OR = odds ratio; Ref. = reference category.
↵* Statistically significant value.