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Table 2 Descriptive analysis of monthly hemorrhagic stroke occurrence and average monthly meteorological and air pollution factors

From: Association between hemorrhagic stroke occurrence and meteorological factors and pollutants

Month HS, n (%) ICH, n (%) SAH, n (%) Mean temperature (°C) Atmospheric pressure (hPa) Humidity (%) Insolation (hour) PM10
(μg/m3)
NO2
(ppb)
O3
(ppb)
Jan 141 (9.5) 106 (10.4) 35 (7.6) −3.7 1015.3 51.3 6.4 62.3 41.6 10.9
Feb 122 (8.3) 95 (9.4) 27 (5.9) 0.9 1014.7 50.2 6.1 62.2 38.5 13.9
Mar 131 (8.9) 77 (7.6) 54 (11.7) 5.2 1008.3 51.7 6.5 62.0 35.9 21.3
Apr 134 (9.1) 93 (9.2) 41 (8.9) 11.0 1004.1 49.9 7.4 64.2 37.0 28.7
May 145 (9.8) 91 (9.0) 54 (11.7) 17.9 1000.6 56.2 6.7 62.1 33.7 30.6
Jun 107 (7.2) 74 (7.3) 33 (7.2) 23.1 997.5 61.7 6.5 43.8 29.1 31.1
Jul 103 (7.0) 70 (6.9) 33 (7.2) 24.6 996.0 79.1 4.1 38.4 25.1 21.6
Aug 117 (7.9) 80 (7.9) 37 (8.0) 26.5 998.3 72.0 4.4 29.4 21.8 23.2
Sep 121 (8.2) 90 (8.9) 31 (6.7) 21.8 1004.2 64.2 5.3 32.2 25.9 19.4
Oct 112 (7.6) 66 (6.5) 46 (10.0) 15.7 1009.0 59.9 7.3 42.0 32.6 14.6
Nov 126 (8.5) 87 (8.6) 39 (8.5) 6.7 1010.9 57.1 5.8 49.3 35.2 12.1
Dec 118 (8.0) 87 (8.6) 31 (6.7) 0.2 1014.1 56.4 5.2 61.0 39.4 9.6
  1. HS Hemorrhagic stroke, ICH, Intracerebral hemorrhage, SAH Subarachnoid hemorrhage, PM 10 Particulate matter less than 10 mm in aerodynamic diameter, NO 2 , Nitrogen dioxide, O 3 , Ozone