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Table 1 Descriptive statistics of daily count of hospital admissions for CVD, air pollutants, and weather conditions in Lanzhou, China, from Jan 1, 2014 to Dec 31, 2019

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

  \(\overline{X}\) ± S Minimum Percentile Maximum
P25 P50 P75
CVD patients (I00–I99)
 Total 116 ± 111 1 39 84 150 676
 Male 69 ± 67 1 23 48 87 398
 Female 47 ± 45 1 17 34 62 304
 < 65 53 ± 50 1 17 35 65 332
 ≥ 65 63 ± 57 1 22 46 85 366
 IHD (I20–I25) 21 ± 19 1 7 14 28 126
 HRD (I47–I48) 16 ± 14 1 4 10 22 111
 HF (I50) 5 ± 4 1 2 3 7 27
 CD (I60–I69) 20 ± 14 1 10 18 26 100
Air pollutants
 PM2.5 (μg/m3) 48.92 ± 26.92 9.00 31.34 42.57 59.13 278.00
 PM10μg/m3) 114.84 ± 82.94 16.00 71.00 99.52 136.30 1484.54
 SO2 (μg/m3) 21.12 ± 13.83 3.54 10.35 17.00 28.23 81.87
 NO2 (μg/m3) 47.34 ± 17.28 7.80 36.08 45.91 54.61 146.60
 O38h (μg/m3) 88.24 ± 38.77 8.00 58.00 82.00 114.00 222.00
 CO (mg/m3) 1.24 ± 0.71 0.20 0.76 1.00 1.52 4.65
Meteorological factors
 Mean temperature (°C) 11.34 ± 9.83 − 12.30 2.40 12.70 19.90 30.40
 Relative humidity (%) 51.03 ± 15.08 11.71 39.50 51.17 62.00 96.09