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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 in GOLD grade of COPD patients. Statistical analysis was performed using multiple linear regression analysis. (A and B) BMI used as the quantitative and qualitative variable to assess the relation of BMI and FEV₁ in GOLD 1–2 grade. (C and D) BMI used as the quantitative and qualitative variable to assess the relation between BMI and FEV₁ in GOLD 3–4 grade. *p<0.05 indicating the significant difference compared to normal weight group.

Abbreviations: BMI, body mass index; COPD, chronic obstructive pulmonary disease; FEV₁, forced expiratory volume in the first second; GOLD, global initiative for obstructive lung disease.