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Table 2 The prevalence of asthma by different characteristics among people 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 Prevalence (%) 95% CI P
Race    0.002a
Han 2.07 1.86–2.29  
Minorities 3.32 2.50–4.38  
Sex    0.231a
Male 2.30 2.00–2.63  
Female 2.04 1.78–2.34  
Age group    < 0.001b
45–49 years 1.17 0.77–1.77  
50–59 years 1.45 1.19–1.78  
60–69 years 2.36 2.01–2.77  
≥ 70 years 3.45 2.92–4.06  
Education    < 0.001b
High-school or above 0.92 0.61–1.39  
Middle-school 1.64 1.29–2.07  
Primary education 2.40 1.97–2.92  
Literate 2.48 2.03–3.03  
Illiterate 2.89 2.42–3.46  
Residence setting    0.242b
Urban 1.88 1.49–2.37  
Urban–rural area 1.87 1.29–2.69  
Rural 2.28 2.04–2.55  
Geographic region    < 0.001b
Northeast 1.57 1.02–2.42  
East 1.87 1.55–2.26  
South Central 1.87 1.51–2.32  
Southwest 2.50 2.01–3.10  
North 2.68 2.12–3.38  
Northwest 3.16 2.34–4.27  
Smoking status    0.005a
Non-smokers 1.91 1.66–2.19  
Smokers 2.52 2.19–2.89  
Type of cooking    0.003a
Clean 1.95 1.73–2.20  
Unclean 2.65 2.26–3.11  
  1. The P value was calculated using Chi-square
  2. CI confidence interval
  3. aChi-square test
  4. bMantel–Haenszel chi-square test