Table 2. Multiple linear regression model for diffusing capacity by exposure status and BMI.

Independent variables	Beta coefficient (95% CI)	P value	R2
Exposure to HD	−5.831 (−11.334 to −0.327)	0.038	0.104
BMI	3.651 (0.566 to 1.903)	< 0.001

BMI = body mass index, CI = confidence interval, HD = humidifier disinfectant.