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Table 1 Daily weather conditions, YLL and death counts of COPD in Ningbo, China, 2011–2015

From: The short term burden of ambient fine particulate matter on chronic obstructive pulmonary disease in Ningbo, China

Variables Mean ± SD Minimum 25th Median 75th Maximum
PM2.5 (μg/m3) 49.58 ± 32.36 5.86 28.25 41.73 61.25 421.71
PM10 (μg/m3) 78.59 ± 48.19 12.86 44.94 66.33 97.97 543.88
SO2 (μg/m3) 21.34 ± 13.84 5.38 12.14 16.94 25.73 112.6
NO2 (μg/m3) 43.41 ± 18.65 7.62 30.12 40.61 55 121.8
Temperature (°C) 17.49 ± 8.94 −1.67 10 18.89 24.44 34.44
Relative humidity (%) 76.41 ± 12.25 31 68 77 86 100
Years of life lost (years)
 Total 80 ± 40 0 51 73 102 278
 Age < 75 years 19 ± 20 0 0 13 30 136
 Age ≥ 75 years 61 ± 30 0 39 55 77 227
 Male 46 ± 27 0 26 42 62 174
 Female 34 ± 22 0 17 30 46 161
 Married 44 ± 27 0 24 39 59 175
 Widowed 33 ± 20 0 18 29 45 144
Daily death counts (No. of deaths)
 Total 10 ± 5 0 7 9 13 34
 Age < 75 years 1 ± 1 0 0 1 2 8
 Age ≥ 75 years 9 ± 4 0 6 8 11 33
 Male 6 ± 3 0 3 5 7 18
 Female 5 ± 3 0 3 4 6 20
 Married 5 ± 3 0 3 4 7 19
 Widowed 5 ± 3 0 3 5 7 20