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Table 1 Statistical descriptions of cardiovascular admissions, atmospheric pollutants, and meteorological variables during the study period (2013–2017)

From: Acute effects of fine particulate matter (PM2.5) on hospital admissions for cardiovascular disease in Beijing, China: a time-series study

  Minimum P25 Median Mean (SD) P75 Maximum
Hospital admission
 Cardiovascular disease 9 106 192 252.4 (165.1) 405 749
 Coronary heart disease 2 77 159 207.1 (141.8) 340 632
 Atrial fibrillation 0 4 10 13.4 (10.5) 22 53
 Heart failure 0 20 29 32.0 (15.5) 43 90
Atmospheric pollutants
 SO2 (μg/m3) 0 4 8 15.31 (18.31) 19 133
 NO2 (μg/m3) 0 34 44. 49.69 (23.34) 61 155
 O3 (μg/m3) 0 49 81 95.66 (63.039) 136 367
 PM10 (μg/m3) 0 50 86 102.30 (75.88) 130 820
 PM2.5 (μg/m3) 0 30 59 76.86 (66.38) 102 477
Meteorological factors
 Average Temperature (°C) −16.92 0.99 14.52 13.09 (12.34) 24.09 38.51
 Maximum Temperature (°C) −13.41 11.88 24.60 24.62 (15.80) 35.83 59.89
 Minimum Temperature (°C) −19.16 −3.88 6.98 6.16 (12.08) 17.06 30.94
 Humidity (%) 1.121 5.24 7.47 24.38 (26.66) 43.30 95.30
 Air pressure (hPa) 970.5 985.50 993.0 993.90 (10.51) 1001.5 1022.40
  1. P25 = 25th percentile. P75 = 75th percentile. CO = carbon monoxide. PM2.5 = particulate matter with an aerodynamic diameter less than 2.5 μm. SO2 = sulfur dioxide. NO2 = nitrogen dioxide. O3 = ozone