Table 5. Association between crowding category and 7-day mortality.
| Crowding category | ||||
|---|---|---|---|---|
| Cohort | 0%-75% | 75%-95% | 95%-100% | |
| All hospitals | Number of deaths, n | 11,517 | 3,184 | 867 |
| Person-years at risk, n | 16,867 | 4,488 | 1,113 | |
| Incidence rate, cases/100 person-years | 68.3 | 70.9 | 77.9 | |
| Adjusted1 HR (95% CI) | Reference | 1.05 (1.00–1.09)2 | 1.02 (0.94–1.10) | |
| Skåne | Number of deaths, n | 6,462 | 1,776 | 492 |
| Person-years at risk, n | 7,525 | 2,000 | 500 | |
| Incidence rate, cases/100 person-years | 85.9 | 88.8 | 98.4 | |
| Adjusted1 HR (95% CI) | Reference | 1.04 (0.98–1.10) | 1.02 (0.92–1.13) | |
| Stockholm | Number of deaths, n | 2,746 | 791 | 178 |
| Person-years at risk, n | 5,890 | 1,576 | 380 | |
| Incidence rate, cases/100 person-years | 46.6 | 50.2 | 46.8 | |
| Adjusted1 HR (95% CI) | Reference | 1.12 (1.03–1.22)3 | 1.11 (0.94–1.32) | |
| Östergötland | Number of deaths, n | 1,686 | 460 | 124 |
| Person-years at risk, n | 2,738 | 727 | 189 | |
| Incidence rate, cases/100 person-years | 61.6 | 63.3 | 65.6 | |
| Adjusted1 HR (95% CI) | Reference | 1.00 (0.89–1.12) | 1.00 (0.82–1.22) | |
1 stratified by hospital, adjusted for age, sex, priority, weekend, hour, arrival mode and chief complaint.
2 P-value = 0.04 (significant).
3 P-value = 0.01 (significant).