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Table 2 Median (interquartile ranges) of ambient air pollutants and meteorological conditions on control and case days

From: Short-term air pollution exposure associated with death from kidney diseases: a nationwide time-stratified case-crossover study in China from 2015 to 2019

 

Overall

Control days

Case days

P-value*

447,845

345,926 (77.2%)

101,919 (22.8%)

 

Particulate matter air pollutants, 2-day moving average (lag 0–1)

 PM1, µg/m3

24.68 (17.24–35.41)

24.66 (17.24–35.41)

24.74 (17.24–35.41)

0.003

 PM2.5, µg/m3

36.36 (25.20–54.52)

36.32 (25.2–54.52)

36.50 (25.2–54.50)

0.038

 PM10, µg/m3

63.32 (44.28–93.84)

63.23 (44.28–93.84)

63.63 (44.28–93.84)

0.033

Gaseous air pollutants, 2-day moving average (lag 0–1)

 CO, mg/m3

0.88 (0.72–1.10)

0.88 (0.72–1.10)

0.88 (0.72–1.10)

0.242

 NO2, µg/m3

26.07 (18.88–36.79)

26.07 (18.88–36.79)

26.08 (18.88–36.79)

0.014

 O3, µg/m3

81.55 (59.38–109.54)

81.55 (59.38–109.54)

81.54 (59.38–109.54)

0.032

 SO2, µg/m3

13.54 (9.60–20.02)

13.53 (9.60–20.02)

13.57 (9.60–20.02)

 < 0.001

Meteorological variables, 5-day moving averages (lag 0–4)

 Relative humidity, %

72.80 (59.26–81.52)

72.84 (59.26–81.52)

72.68 (59.26–81.52)

0.291

 Temperature, Celsius

16.25 (7.92–22.86)

16.28 (7.92–22.86)

16.14 (7.92–22.86)

0.010

  1. *The p-values were calculated using univariate conditional logistic regression with accounting for the nesting nature of patients in a case-crossover design