Table 6. Association between crowding category and 30-day mortality for admitted patients.
| Crowding category | ||||
|---|---|---|---|---|
| Cohort | 0%-75% | 75%-95% | 95%-100% | |
| All hospitals | Number of deaths, n | 26,365 | 7,293 | 1,919 |
| Person-years at risk, n | 39,516 | 10,532 | 2,628 | |
| Incidence rate, cases/100 person-years | 66.7 | 69.2 | 73.0 | |
| Adjusted1 HR (95% CI) | Reference | 1.04 (1.01–1.07) | 1.03 (0.98–1.08) | |
| Skåne | Number of deaths, n | 14,058 | 3,953 | 986 |
| Person-years at risk, n | 18,101 | 4,828 | 1,206 | |
| Incidence rate, cases/100 person-years | 77.7 | 81.9 | 81.7 | |
| Adjusted1 HR (95% CI) | Reference | 1.04 (1.00–1.08)2 | 1.01 (0.94–1.08) | |
| Stockholm | Number of deaths, n | 7,615 | 2,087 | 536 |
| Person-years at risk, n | 15,231 | 4,062 | 1,016 | |
| Incidence rate, cases/100 person-years | 50.0 | 51.4 | 52.8 | |
| Adjusted1 HR (95% CI) | Reference | 1.06 (1.01–1.12) | 1.11 (1.01–1.22) | |
| Östergötland | Number of deaths, n | 3,201 | 888 | 221 |
| Person-years at risk, n | 4,291 | 1,140 | 288 | |
| Incidence rate, cases/100 person-years | 74.6 | 77.9 | 76.7 | |
| Adjusted1 HR (95% CI) | Reference | 1.03 (0.96–1.12) | 1.02 (0.88–1.17) | |
1 stratified by hospital, adjusted for age, sex, priority, weekend, hour, arrival mode and chief complaint.
2 P-value = 0.03 (significant).