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Table 1 Socio-demographic characteristics of the respondents
| Socio-demographic characteristics | Subject | |
|---|---|---|
| Number (n = 1207) | Percentage (%) | |
| Gender | ||
| Male | 588 | 48.7 |
| Female | 619 | 51.3 |
| Age distribution (years) | ||
| 18–39 | 493 | 40.8 |
| 40–59 | 485 | 40.2 |
| ≥ 60 | 229 | 19.0 |
| Ethnic group | ||
| Han | 1154 | 95.6 |
| Ethnic of minority | 53 | 4.4 |
| Marital status | ||
| Not-married | 208 | 17.2 |
| Married | 999 | 82.8 |
| Education | ||
| Senior high school and above | 771 | 63.9 |
| Below senior high school | 436 | 36.1 |
| BMI (kg/m2) | ||
| Underweight (BMI < 18.5 kg/m2) | 212 | 17.6 |
| Normal weight (18.5 ≤ BMI < 23 kg/m2) | 757 | 62.7 |
| Overweight (BMI ≥ 23 kg/m2) | 238 | 19.7 |
| Asthma-like symptoms and asthma in childhood | ||
| Yes | 268 | 22.2 |
| No | 939 | 77.8 |
| Familial history of asthma-like symptoms and asthma | ||
| Yes | 375 | 31.1 |
| No | 832 | 68.9 |
| Monthly household income | ||
| Low household income | 247 | 20.5 |
| High household income | 960 | 79.5 |
| Occupational exposure to dust or gas | ||
| Yes | 242 | 20.0 |
| No | 965 | 80.0 |
