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Z score (observed—predicted/SD about regression line) means and 95% confidence intervals for FEV1, FVC, and FEV1% for Chinese men and women by BMI quintile. In males: Q1: ≤17.94; Q2: 17.95–19.66; Q3: 19.67–21.59; Q4: 21.6–23.64; Q5: 23.65–30.78; in females: Q1: ≤17.94; Q2: 17.95–19.53; Q3: 19.54–20.89; Q4: 20.9–22.94; Q5: 22.94–31.4. BMI = body mass index, FEV1 = forced expiratory volume in 1 second, FVC = forced vital capacity.
