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. 2020 Oct 13;15:2477–2486. doi: 10.2147/COPD.S265676

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© 2020 Zhu et al.

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The effect of BMI on FEV₁% and FVC in GOLD grade of COPD patients. Statistical analysis was performed using multiple linear regression analysis. The curve and the 95% CI area were obtained from the regression equation by fixing each covariate at a certain level. (A and B) BMI used as the quantitative variable to assess the relation of BMI and FEV₁% in GOLD 1–2 grade and GOLD 3–4 grade. (C and D) BMI used as the quantitative variable to assess the relation between BMI and FVC in GOLD 1–2 grade and GOLD 3–4 grade.

Abbreviations: BMI, body mass index; COPD, chronic obstructive pulmonary disease; FEV₁%, predicted percentage of forced expiratory volume in the first second; FVC, forced vital capacity; GOLD, global initiative for obstructive lung disease.