Table 2.
The Relationship Between BMI and Lung Function According to COPD-SQ Scores
| Participants | BMI | FEV1 | FVC | FEV1/FVC | |||
|---|---|---|---|---|---|---|---|
| Unadjusted | Adjusted | Unadjusted | Adjusted | Unadjusted | Adjusted | ||
| People not at risk of COPD | BMI<18.5 | −0.10 (−0.25, 0.06) | −0.49 (−0.68, −0.29) | −0.01 (−0.13, 0.11) | −0.26 (−0.43, −0.09) | −2.36 (−3.50, −1.22) | −2.97 (−4.11, −1.84) |
| 18.5≤BMI<23.9 | Ref | Ref | Ref | Ref | Ref | Ref | |
| 24.0≤BMI<27.9 | −0.06 (−0.10, −0.02) | 0.04 (−0.02, 0.10) | −0.06 (−0.10, −0.03) | −0.04 (−0.09, 0.00) | 0.30 (−0.07, 0.68) | 1.22 (0.83, 1.61) | |
| 28.0≤BMI<34.9 | −0.15 (−0.21, −0.09) | −0.07 (−0.15, 0.00) | −0.14 (−0.19, −0.09) | −0.15 (−0.22, −0.09) | 0.17 (−0.32, 0.67) | 1.21 (0.70, 1.72) | |
| BMI≥35.0 | −0.38 (−0.67, −0.10) | −0.42 (−0.76, −0.07) | −0.25 (−0.48, −0.01) | −0.29 (−0.59, 0.01) | −0.45 (−2.69, 1.79) | 0.32 (−1.96, 2.60) | |
| People at risk of COPD | BMI<18.5 | −0.59 (−0.67, −0.51) | −0.63 (−0.73, −0.54) | −0.45 (−0.52, −0.38) | −0.51 (−0.59, −0.43) | −2.38 (−2.82, −1.95) | −2.47 (−2.94, −2.01) |
| 18.5≤BMI<23.9 | Ref | Ref | Ref | Ref | Ref | Ref | |
| 24.0≤BMI<27.9 | 0.13 (0.08, 0.17) | 0.33 (0.27, 0.38) | 0.00 (−0.01, 0.01) | 0.01 (−0.01, 0.03) | 1.34 (1.07, 1.62) | 2.23 (1.93, 2.53) | |
| 28.0≤BMI<34.9 | 0.04 (−0.04, 0.11) | 0.31 (0.22, 0.39) | −0.09 (−0.15, −0.03) | 0.01 (−0.02, 0.03) | 1.69 (1.26, 2.13) | 2.70 (2.24, 3.15) | |
| BMI≥35.0 | −0.30 (−0.69, 0.09) | 0.09 (−0.35, 0.53) | −0.39 (−0.72, −0.05) | −0.15 (−0.54, 0.24) | 1.08 (−1.22, 3.38) | 2.28 (−0.03, 4.59) | |
Notes: Adjusted model: sex, age, smoke, cough, breath shortness, biofuel use and family history.
Abbreviations: BMI, body mass index; COPD-SQ, the COPD Screening Questionnaire; COPD, Chronic Obstructive Pulmonary Disease; FEV1, the predicted forced expiratory volume in one second; FVC, the Predicted forced vital capacity.