Table 1.
Descriptive statistics of the data and daily emergency hospital visits and daily pollutants during the study period and stratified by time-strata used in the analysis.
| Emergency Hospital Visits | 2007–2012 | |||||||
|---|---|---|---|---|---|---|---|---|
| Number of admissions and ER visits | 22,892 | |||||||
| Individuals (n) | 11,567 | |||||||
| Age at first admission, mean (sd) | 68.1 (16.1) | |||||||
| Percentage female (n) | 46.3 (5351) | |||||||
| Daily Pollutant Levels |
2007–2012 n = 2192 |
Volcanic Ash n = 20 |
Dust Storm n = 14 |
Other Sources n = 83 |
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| Mean | sd | Mean | sd | Mean | sd | Mean | sd | |
| PM10 (µg/m3) | 21.8 | 23.9 | 145.5 | 121.5 | 88.5 | 26.3 | 78.8 | 35.0 |
| H2S (µg/m3) | 3.2 | 5.7 | 3.4 | 3.4 | 2.5 | 5.0 | 4.0 | 8.3 |
| NO2 (µg/m3) | 18.2 | 13.2 | 8.3 | 8.1 | 10.5 | 8.1 | 25.2 | 19.5 |
| Temperature (°C) | 6.0 | 5.3 | 6.4 | 7.1 | 6.9 | 6.4 | 5.7 | 6.4 |
| Relative humidity (%) | 76.6 | 11.0 | 66.3 | 7.0 | 65.7 | 5.3 | 67.4 | 10.6 |
sd: standard deviation.