Table 1 The characteristics and comorbidities of study population (n = 670)
From: Atrial fibrillation hospitalization is associated with exposure to fine particulate air pollutants
Variables | N | (%) | Mean ± SD |
|---|---|---|---|
Age | 670 | (100.0) | 70.5 ± 14.0 |
 < 65 | 188 | (28.1) |  |
 ≥ 65 | 482 | (71.9) |  |
Gender | |||
 Male | 343 | (51.2) |  |
Comorbidity | |||
 Coronary artery disease | 447 | (66.7) |  |
 Congestive heart failure | 287 | (42.8) |  |
 Hypertension | 529 | (79.0) |  |
 Hyperlipidemia | 257 | (38.4) |  |
 COPD | 112 | (16.7) |  |
 Diabetes mellitus | 213 | (31.8) |  |
 Chronic kidney disease | 57 | (8.5) |  |