Table 1 Descriptive statistics of ER hospital admissions for respiratory symptoms in total and by year, age-group, sex, and season
Characteristic | Number of visits | (%) |
|---|---|---|
ER admissions for all causes | 1,014,272 | Â |
ER admissions for respiratory symptoms | 49,127 | Â |
   2005 | 16,960 | (34.5) |
   2006 | 15,932 | (32.4) |
   2007 | 16,235 | (33,1) |
   Daily ER admissions [mean (range)] | 44.9 (17-96) |  |
   Duplicates within the same day for each study subject | 608 | (1.2) |
   Total ER visits w/o same day duplicates | 48,519 |  |
Season | Â | Â |
   Warm (April to September) | 22,759 | (46.9) |
   Cold (October to March) | 25,760 | (53.1) |
Age group (years) | Â | Â |
   16-44 | 14,988 | (30,9) |
   45-54 | 4,698 | (9.7) |
   55-64 | 5,936 | (12.2) |
   65-74 | 9,236 | (19.0) |
   75-84 | 10,139 | (20.9) |
   ≥85 | 3,522 | (7.3) |
   Age subjects [years, mean (SD)] | 56.4 (37) |  |
Sex | Â | Â |
   Female | 21,516 | (44.4) |
   Male | 26,934 | (55.5) |
   (missing) | 69 | (0.1) |