Table 4.
Crude and multivariate-adjusted ORs (95% CI) for decreased pulmonary function parameters according to BMI.
| BMI category | Crude OR (95% CI) | Multivariate-adjusted OR (95% CI) |
|---|---|---|
| Predicted FEV1% < 80% | ||
| Obese | 1.00 (reference) | 1.00 (reference) |
| Normal | 0.872 (0.81–0.90) | 0.93 (0.90–0.97) |
| Underweight | 1.77 (1.69–1.85) | 2.10 (1.98–2.21) |
| P for trend | <0.001 | <0.001 |
| Predicted FVC% < 80% | ||
| Obese | 1.00 (reference) | 1.00 (reference) |
| Normal | 1.58 (1.52–1.64) | 1.32 (1.27–1.38) |
| Underweight | 8.44 (8.04–8.86) | 4.90 (4.62–5.18) |
| P for trend | <0.001 | <0.001 |
| FEV1/FVC < 70% | ||
| Obese | 1.00 (reference) | 1.00 (reference) |
| Normal | 0.86 (0.81–0.91) | 1.14 (1.06–1.23) |
| Underweight | 0.35 (0.29–0.41) | 0.95 (0.75–1.19) |
| P for trend | <0.001 | 0.009 |
BMI, body mass index; FEV1, Forced expiratory volume in first second; FVC, forced vital capacity.
The multivariable model was adjusted for age, sex, height, status of smoking, vigorous exercise (times/week), diabetes, and high-sensitivity C-reactive protein. BMI categories: normal (between 18.5 and 25 kg/m2), underweight (<18.5 kg/m2), and obese (≥25 kg/m2).