Table 2. Overall admission characteristics before matching.
| Variables | DMP patients (n=309) | Controls (n=893) | P value |
|---|---|---|---|
| Episodes | 488 | 1,227 | – |
| ALOS (mean ± SD) (days) | 4.40±4.70 | 4.70±5.10 | 0.0435† |
| Total hospital days | 2,122 | 5,764 | – |
| Average hospital days per patient | 6.90 | 6.50 | 0.2260↕ |
| Total person years of follow up | 268.83 | 738.63 | – |
| No. of days admitted to hospital per 100 person year | 2.16 | 2.14 | 0.6511┤ |
| No. of deaths (%) | 35 (11.3) | 173 (19.4) | 0.0003‡ |
| Deaths due to respiratory system diseases (%) | 25 (8.1) | 124 (13.9) | 0.0001‡ |
| Crude all-cause mortality rate‡ per person year (95% CI) | 0.13 (0.09–0.18) | 0.24 (0.20–0.27) | 0.0008┤ |
| Crude mortality rate‡ per person year, respiratory system diseases (95% CI) | 0.09 (0.06–0.14) | 0.17 (0.14–0.20) | 0.0034┤ |
| Readmission rate per person year (95% CI) | 0.33 (0.26–0.41) | 0.23 (0.19–0.27) | 0.0094┤ |
| 30-day readmission rate per person year, (95% CI) | 0.12 (0.08–0.17) | 0.05 (0.04–0.07) | 0.0013┤ |
| No. of days admitted to hospital per 100 person days | 2.16 (2.07–2.25) | 2.14 (2.08–2.19) | 0.6511┤ |
†, Wilcoxon rank sum test; ↕, Student t-test; ‡, Z test for proportion; ┤, IRI, incidence rate comparison, (STATA). ALOS, average length of stay; SD, standard deviation.