Table 4.
Comparison of unadjusted and adjusted incidence rates of mortality and re-admission to ICU between pulmonary and non-pulmonary disorder groups
| Incidence rate | Non-pulmonary disorder (n = 9,063) | Pulmonary disorder (n = 3,875) |
|---|---|---|
| Overall mortality | ||
| Total events | 3,767 | 2,333 |
| Total person-time, person-year | 35,200 | 9,113 |
| Incidence rate, per 1000 person-years | 107 | 256 |
| Incidence rate ratio (95% CI) | - | 2.39 (2.27–2.52) |
| Adjusted incidence rate ratioa (95% CI) | - | 1.22 (1.18–1.27) |
| Re-admission to ICU | ||
| Total events | 1,400 | 884 |
| Total person-time, person-year | 28,225 | 6,435 |
| Incidence rate, per 1000 person-years | 50 | 137 |
| Incidence rate ratio (95% CI) | - | 2.77 (2.55–3.01) |
| Adjusted incidence rate ratiob (95% CI) | - | 1.26 (1.17, 1.36) |
ICU, intensive care unit; CI, confidence interval.
a
Poisson regression analysis was conducted with variables, including age, sex, residence, particulate matter of 10-μm diameter or less, ozone concentration increase compared with the previous year, number of total and tertiary healthcare units per area, income, Charlson comorbidity index, disability, course of admission to hospital, and ICU patient volume.
b
Poisson regression analysis was conducted with variables, including age, sex, residence, number of total and tertiary healthcare units per area, income, Charlson comorbidity index, and disability.