Association between ΔBMI/y and annual decline in lung function after adjusting for other factors among BMI groups
| ΔBMI/y | ||||
| Normal weight | Overweight/obese | |||
| B | 95% confidence interval | B | 95% confidence interval | |
| ΔFEV1pp/y | −0.356 | (−0.663– −0.049) | −0.747 | (−1.003– −0.491) |
| ΔFEV1mL/y | −14.662 | (−24.903– −4.420) | −24.809 | (−33.608– −16.010) |
| ΔFVCpp/y | −0.102 | (−0.436–0.232) | −0.719 | (−1.026– −0.413) |
| ΔFVCmL/y | −10.091 | (−23.509–3.328) | −34.422 | (−48.073– −20.772) |
| ΔFEV1/FVC/y | −0.002 | (−0.004–0.000) | −0.000 | (−0.002–0.002) |
Significant values are given in bold. Normal weight: BMI 18.5–24.9; overweight/obese: BMI ≥25. Adjusting factors: sex, age, changes in smoking habits, pack-years, inhaled corticosteroid use, occupational gas, dust or fumes exposure at follow-up and original cohort. BMI: body mass index; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; B: β-coefficient from linear regression models; ΔBMI/y: annual BMI change; ΔFEV1pp/y: annual FEV1pp decline; ΔFVCpp/y: annual FVCpp decline; pp: per cent of predicted; ΔFEV1mL/y: annual FEV1mL decline; ΔFVCmL/y: annual FVCmL decline; ΔFEV1/FVC/y: annual FEV1/FVC decline.