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Table 3 Relationship of risk factors and the prevalence of asthma from the multivariable regression analysis

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

Risk factor OR (95% CI) P
Race   
Han (reference) 1.00 .
Minorities 1.55 (1.12–2.14) 0.008
Age   
45–49 years (reference) 1.00 .
50–59 years 1.24 (0.77–1.98) 0.374
60–69 years 1.85 (1.17–2.92) 0.008
≥ 70 years 2.63 (1.66–4.17) < 0.001
Education   
High-school or above (reference) 1.00 .
Middle-school 1.88 (1.15–3.05) 0.011
Primary education 2.48 (1.55–3.98) < 0.001
Literate 2.53 (1.57–4.07) < 0.001
Illiterate 2.78(1.72–4.49) < 0.001
Geographic region   
East (reference) 1.00 .
North 1.52 (1.11–2.09) 0.010
Northeast 0.86 (0.52–1.40) 0.532
Northwest 1.71 (1.18–2.49) 0.005
South Central 1.02 (0.76–1.37) 0.885
Southwest 1.16 (0.85–1.56) 0.349
Smoking status   
Non-smokers (reference) 1.00 .
Smokers 1.37 (1.11–1.68) 0.003
Type of cooking   
Clean (reference) 1.00 .
Unclean 1.07 (0.86–1.32) 0.564
  1. These variables with a P < 0.05 in univariate comparison were included in the multivariate logistic regression analysis
  2. OR odds ratio, CI confidence interval