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Table 1 Descriptive statistics of ER hospital admissions for respiratory symptoms in total and by year, age-group, sex, and season

From: Urban air pollution and emergency room admissions for respiratory symptoms: a case-crossover study in Palermo, Italy

Characteristic Number of visits (%)
ER admissions for all causes 1,014,272  
ER admissions for respiratory symptoms 49,127  
   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   
   Warm (April to September) 22,759 (46.9)
   Cold (October to March) 25,760 (53.1)
Age group (years)   
   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   
   Female 21,516 (44.4)
   Male 26,934 (55.5)
   (missing) 69 (0.1)