Table 1 Sample description
Characteristic | Groups | Distribution (n, %) |
|---|---|---|
Age (years old) | 41–50 | 67 (16.8%) |
51–60 | 79 (19.8%) | |
61–70 | 88 (22%) | |
71–80 | 81 (20.2%) | |
81–90 | 85 (21.2%) | |
Gender | Male | 201 (50.2%) |
Female | 199 (49.8%) | |
Education | Primary school and below | 139 (34.8%) |
Middle school | 144 (36%) | |
High school | 80 (20%) | |
College and above | 37 (9.2%) | |
Average family income (CNY/year) | < 20,000 | 136 (34%) |
20,000–35,000 | 144 (36%) | |
> 35,000 | 120 (30%) | |
Household air purifier use | Yes | 19 (4.8%) |
No | 381 (95.2%) | |
History of cardiovascular disease | Yes | 184 (46%) |
No | 216 (54%) | |
History of respiratory disease | Yes | 68 (17%) |
No | 332 (83%) |