Table 3. Multiple linear regression model for diffusing capacity by exposure status and BMI, FVC.

Independent variables	Beta coefficient (95% CI)	P value	R2
Exposure to HD	−2.799 (−7.909 to 2.310)	0.281	0.261
BMI	1.475 (0.862 to 2.087)	< 0.001
FVC%	0.427 (0.411 to 5.656)	< 0.001

BMI = body mass index, FVC = forced vital capacity, CI = confidence interval, HD = humidifier disinfectant.