Table 1

Descriptive statistics of daily number of asthma admissions, meteorological factors and air pollutants in Hong Kong during 2004–2011

Min.3rd
percentile
25th
percentile
MedianMean75th
percentile
97th
percentile
Max.
Whole year
 Daily no. of asthma admissions5.009.0015.0019.0019.2023.0032.0046.00
 Mean temperature (°C)8.8012.7019.3024.6023.3627.8030.0331.80
 Mean RH (%)31.0053.0073.0079.0077.9485.0094.0098.00
 Solar radiation (MJ/m2)0.642.448.3413.9713.5118.0525.5828.81
 Wind speed (km/h)3.006.8015.1021.9022.4728.6042.7370.00
 PM10 (μg/m3)9.7518.9031.2549.4453.7971.23109.36586.40
 SO2 (μg/m3)3.705.7910.7615.8518.6822.8348.77113.97
 NO2 (μg/m3)14.4127.3146.5159.6162.1575.18110.23180.07
 O3 (μg/m3)6.1711.0718.9832.9736.2349.3778.20122.12
Hot seasons
 Daily no. of asthma admissions5.008.0014.0017.0017.4521.0029.0040.00
 Mean temperature (°C)18.7023.6026.1027.8027.5229.1030.4031.80
 Mean RH (%)45.0062.0075.0080.0079.8885.0094.0098.00
 Solar radiation (MJ/m2)0.733.1810.4016.1815.5420.7926.6828.81
 Wind speed (km/h)3.206.7013.5019.3521.0727.0044.5870.00
 PM10 (μg/m3)14.4217.7524.8634.3643.3356.18102.45154.08
 SO2 (μg/m3)3.875.6110.0815.4318.8622.9655.24113.97
 NO2 (μg/m3)14.4124.9738.8050.7654.2365.83100.67142.10
 O3 (μg/m3)6.1711.3417.3725.9934.4349.1279.50120.87
Cold seasons
 Daily no. of asthma admissions7.0011.0016.0020.0020.9825.0034.0046.00
 Mean temperature (°C)8.8011.7016.7019.3019.1521.8025.8527.80
 Mean RH (%)31.0048.0069.0078.0075.9785.0094.0097.00
 Solar radiation (MJ/m2)0.642.136.7412.3111.4515.7421.0227.70
 Wind speed (km/h)3.007.5017.6023.8023.8929.8041.8960.70
 PM10 (μg/m3)9.7526.2145.1660.9264.4078.79117.69586.40
 SO2 (μg/m3)3.706.5111.4116.1118.4922.7642.42107.46
 NO2 (μg/m3)25.3440.6255.5267.1070.2080.89117.71180.07
 O3 (μg/m3)6.3710.6923.6236.8538.0649.4676.50122.12
  • RH, relative humidity.