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Table 1 General characteristics of the participants among aged 45 and older

From: Prevalence of and risk factors for asthma among people aged 45 and older in China: a cross-sectional study

Characteristic Total Asthma Non-Asthma
Participants 18,395 (100%) 398 (2.16%) 17,997 (97.84%)
Race    
Han 16,977 (92.3%) 351 (88.2%) 16,626 (92.4%)
Minorities 1418 (7.7%) 47 (11.8%) 1371 (7.6%)
Sex    
Male 8744 (47.5%) 201 (50.5%) 8543 (47.5%)
Female 9651 (52.5%) 197(49.5%) 9454 (52.5%)
Age group    
45–49 years 1884 (10.2%) 22 (5.5%) 1862 (10.4%)
50–59 years 6326 (34.4%) 92 (23.1%) 6234 (34.6%)
60–69 years 6179 (33.6%) 146 (36.7%) 6033 (33.5%)
≥ 70 years 4006 (21.8%) 138 (34.7%) 3868 (21.5%)
Education    
High-school or above 2389 (13.0%) 22 (5.5%) 2367(13.2%)
Middle-school 4087 (22.2%) 67 (16.8%) 4020 (22.3%)
Primary education 4049 (22.0%) 97 (24.4%) 3952 (22.0%)
Literate 3828 (20.8%) 95 (23.9%) 3733 (20.7%)
Illiterate 4042 (22.0%) 117 (29.4%) 3925 (21.8%)
Residence setting    
Urban 3724 (20.3%) 70 (17.6%) 3654 (20.3%)
Urban–rural area 1498 (8.1%) 28 (7.0%) 1470 (8.2%)
Rural 13,173 (71.6%) 300 (75.4%) 12,873 (71.5%)
Geographic region    
Northeast 1274 (6.9%) 20 (5.0%) 1254 (7.0%)
East 5666 (30.8%) 106 (26.6%) 5560 (30.9%)
South Central 4387 (23.8%) 82 (20.6%) 4305(23.9%)
Southwest 3199 (17.4%) 80 (20.1%) 3119 (17.3%)
North 2572 (14.0%) 69 (17.4%) 2503 (13.9%)
Northwest 1297 (7.1%) 41 (10.3%) 1256 (7.0%)
Smoking status    
Non-smokers 10,643 (58.1%) 203 (51.1%) 10,440 (58.2%)
Smokers 7752 (41.9%) 195 (48.9%) 7557 (41.8%)
Type of cooking    
Clean 12,895 (70.1%) 252 (63.3%) 12,643 (70.3%)
Unclean 5500 (29.9%) 146 (36.7%) 5354 (29.7%)
  1. Smokers were defined as current smokers who smoking more than 100 cigarettes in your life