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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