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Table 4 Distributions of the relative risks for arrhythmia at various levels of air pollutants in different subgroups and seasons a

From: Associations between air pollution and outpatient visits for arrhythmia in Hangzhou, China

Variables PM2.5 PM10 SO2 NO2 CO O3
Overall 1.007
(0.992, 1.022)
1.007
(0.997, 1.018)
1.119
(1.045, 1.199)
1.067
(1.037, 1.099)
1.113
(0.941, 1.316)
0.991
(0.971, 1.012)
Gender
 Male 1.018
(0.999, 1.037)
1.009
(0.996, 1.023)
1.112
(1.028, 1.201)
1.071
(1.032, 1.112)
1.251
(1.013, 1.546)
0.989
(0.963, 1.016)
 Female 0.997
(0.979, 1.016)
1.006
(0.993, 1.018)
1.137
(1.032, 1.210)
1.064
(1.027, 1.102)
1.011
(0.824, 1.239)
0.993
(0.968, 1.018)
Age
  < 45 1.018
(0.990, 1.048)
1.013
(0.993, 1.033)
1.105
(0.973, 1.255)
1.109
(1.050, 1.171)
1.052
(0.763, 1.450)
0.989
(0.954, 1.027)
 45–60 1.007
(0.988, 1.026)
1.010
(0.997, 1.023)
1.154
(1.062, 1.255)
1.076
(1.038, 1.116)
1.184
(0.962, 1.457)
0.984
(0.958, 1.010)
  ≥ 60 0.995
(0.972, 1.019)
0.998
(0.982, 1.014)
1.077
(0.963, 1.204)
1.027
(0.981, 1.076)
1.013
(0.781, 1.313)
1.004
(0.970, 1.038)
Season
 Warm 0.989
(0.963, 1.015)
0.994
(0.977, 1.011)
1.052
(0.924, 1.195)
0.995
(0.944, 1.048)
0.944
(0.698, 1.276)
0.997
(0..962, 1.033)
 Cold 1.016
(0.997, 1.033)
1.013
(0.999, 1.026)
1.122
(1.034, 1.223)
1.075
(1.033, 1.119)
1.142
(0.903, 1.443)
0.982
(0.925, 1.042)
  1. aFor PM2.5, PM10, SO2, NO2, and O3, the relative risks were associated with increments of 10 μg/m3; for CO the increment was 1 mg /m3. A Cochran Q test was used to test for differences between subpopulations, and no statistically significant differences were found between subpopulations