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Table 1 Summary statistics of daily hospital outpatient visits, weather conditions, and air pollutants in Dongguan (2013–2017)

From: Morbidity burden of respiratory diseases attributable to ambient temperature: a case study in a subtropical city in China

Variable Mean ± SD Percentile
Min P25 P50 P75 Max
Daily outpatients
 Respiratory 44 ± 11 3 38 44 52 89
 asthma 17 ± 6 0 12 16 21 44
 COPD 7 ± 3 0 4 6 8 21
 Bronchiectasis 5 ± 3 0 3 5 6 15
Meteorological factors
 Temperature (°C) 23.2 ± 5.8 3.8 19.0 24.8 28.0 33.2
 Relative humidity (%) 77.5 ± 13.4 22.0 70.0 79.0 87.0 100.0
Air pollution (μg/m3)
 PM10 56.6 ± 28.3 7.7 35.5 49.4 71.0 217.9
 SO2 15.9 ± 8.4 3.1 10.0 13.8 19.3 60.3
 NO2 38.8 ± 16.3 9.0 27.4 36.0 47.0 137.3
 O3 62.0 ± 34.7 5.2 37.9 55.5 79.8 304.9