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Table 2 Summary statistics for daily weather conditions and air pollutants in Guangzhou, China, 2003 to 2012

From: The impact of ambient air pollution on suicide mortality: a case-crossover study in Guangzhou, China

Variables Frequency distribution Mean SD
  Min 25 % Median 75 % Max   
Mean temperature (°C) 5.1 18.2 24.2 27.7 34.2 22.6 6.3
 Case periods 5.4 18.9 24.5 27.9 34.2 23.0 6.1
 Control periods 5.1 18.5 24.7 27.9 34.2 22.9 6.3
Relative humidity (%) 20.0 65.0 74.0 82.0 99.0 72.4 13.0
 Case periods 22.0 65.0 75.0 82.0 99.0 73.2 12.5
 Control periods 23.0 66.0 75.0 82.0 99.0 72.8 13.0
Atmospheric pressure (hpa) 987.4 1002.5 1007.4 1013.0 1027.2 1007.7. 7.0
 Case periods 987.4 1 001.9 1 006.8 1 012.7 1 025.2 1 007.2 7.1
 Control periods 987.4 1 002.1 1 006.9 1 012.8 1 027.2 1 007.3 7.0
Sunshine duration (hours) 0.0 0.3 4.1 7.8 11.8 4.3 3.6
 Case periods 0.0 0.3 3.9 7.6 11.8 4.2 3.6
 Control periods 0.0 0.2 4.0 7.7 11.8 4.3 3.6
PM10 (μg/m3) 7.0 48.3 70.6 100.6 370.1 79.6 43.8
 Case periods 7.0 48.6 71.7 103.6 370.1 81.2 44.2
 Control periods 7.0 48.0 70.4 99.4 370.1 78.9 42.4
SO2 (μg/m3) 2.3 21.4 37.1 60.9 237.3 46.3 34.3
 Case periods 3.0 23.1 38.5 64.6 226.1 48.3 35.3
 Control periods 2.3 21.3 36.4 60.1 237.3 46.1 34.6
NO2 (μg/m3) 16.7 43.2 57.8 78.8 281.3 65.3 30.4
 Case periods 16.7 43.7 59.4 79.9 254.7 66.6 31.3
 Control periods 16.7 43.0 57.7 77.7 281.3 64.5 29.5