Odds of having COPD in wave 9 in never-smokers with 95% confidence interval, multivariable model

Predictor variableOR (95% CI)p-value
BMI1.01 (0.97–1.05)0.736
Education level0.042
 Less than high schoolReference
 High school/trade/diploma0.63 (0.40–0.98)
 University/postgraduate0.58 (0.30–1.03)
SEIFA (per 100 units)0.95 (0.76–1.21)0.692
Breathing difficulties<0.001
 Rarely2.31 (1.34–3.86)
 Sometimes/often1.68 (0.89–3.08)
Presence of asthma0.083
 Yes1.65 (0.92–2.89)
SF-36 PCS (per 10units)0.84 (0.67–1.05)0.115
SF-36 MCS (per 10units)0.78 (0.66–0.94)0.008

BMI: body mass index; SEIFA: Socioeconomic Indexes for Areas; SF-36 PCS: physical component summary; SF-36 MCS: mental component summary.