TABLE 1.
Number of hospital admissions by age-group and study period.
| All years | Period 1 | Period 2 | ||
|---|---|---|---|---|
| 2007–2018 | 2007–2012 | 2013–2018 | ||
| N = 692,522 | N = 304,378 | N = 388,144 | ||
| Total admissions a | N (%) | N (%) | N (%) | Age-group vs 35–49 IRR (95% CI) a |
| 18–35 years | 129,687 (18.7) | 57,405 (18.9) | 72,282 (18.6) | 1.14 (1.06, 1.21)<0.001 |
| 35–49 years | 113,558 (16.4) | 52,564 (17.3) | 60,994 (15.7) | 1.00 (Reference group)- |
| 50–64 ears | 143,416 (20.7) | 64,731 (21.3) | 78,685 (20.3) | 1.26 (1.17, 1.36)p < 0.001 |
| 65–79 years | 97,611 (25.15) | 74,166 (24.4) | 97,611 (25.15) | 1.50 (1.40, 1.61)<0.001 |
| 80 + years | 78,572 (20.2) | 55,512 (18.2) | 78,572 (20.2) | 1.17 (1.05, 1.29)p = 0.003 |
| — | — | — | — | Period 2 vs period 1 IRR (95% CI) a |
| All ages | — | 304,378 (100.0) | 388,144 (100.0) | 1.27 (1.22, 1.33) p < 0.001 |
| Daily admission rate | N/day Mean (SD) | N/day Mean (SD) | N/day Mean (SD) | Period 2 vs period 1 IRR (95% CI) a |
| 18–35 years | 29.6 (9.6) | 26.2 (8.9) | 33.0 (9.1) | 1.26 (1.24, 1.28) p < 0.001 |
| 35–49 years | 25.9 (9.5) | 24.0 (9.2) | 27.8 (9.4) | 1.16 (1.14, 1.19) p < 0.001 |
| 50–64 years | 32.7 (12.3) | 29.5 (10.8) | 35.9 (12.9) | 1.22 (1.19, 1.24) p < 0.001 |
| 65–79 years | 39.2 (15.3) | 33.8 (12.4) | 44.6 (16.1) | 1.32 (1.29, 1.35) p < 0.001 |
| 80 + years | 30.6 (11.0) | 25.3 (8.6) | 35.9 (10.5) | 1.42 (1.39, 1.44) p < 0.001 |
| All ages | 31.6 (12.5) | 27.8 (10.7) | 34.4 (13.1) | 1.28 (1.26, 1.29) p < 0.001 |
| Admissions per patient | Mean (SD) | Mean (SD) | Mean (SD) | Period 2 vs Period 1 IRR (95% CI) b |
| 18–35 years | 1.85 (6.1) | 1.8 (4.6) | 1.9 (7.1) | 1.047 (1.000, 1.098)p = 0.054 |
| 35–49 years | 2.1 (9.7) | 2.1 (10.2) | 2.1 (9.3) | 1.008 (0.932, 1.091)p = 0.836 |
| 50–64 years | 2.6 (14.0) | 2.6 (16.0) | 2.6 (12.1) | 0.981 (0.894,1.076)p = 0.679 |
| 65–79 years | 3.1 (17.5) | 3.2 (18.4) | 3.0 (16.8) | 0.957 (0.870, 1.053)p = 0.369 |
| 80 + years | 3.3 (18.2) | 3.2 (17.3) | 3.5 (18.9) | 1.095 (0.983, 1.220)p = 0.099 |
| All ages | 2.5 (13.3) | 2.5 (13.7) | 2.5 (13.1) | 1.024 (0.984, 1.066)p = 0.243 |
N, Number; CI, Confidence Interval; IRR, Incidence rate ratio; SD, standard deviation.
a
Obtained using negative binomial regression and robust standard errors with age-group and period as fixed effects and the sum of all adult admissions each day as the dependent variable.
b
Obtained using negative binomial regression and robust standard errors with age-group and period as fixed effects and the sum of an individual patient’s admissions as the dependent variable.