Table 1.

Baseline characteristics of all included patients

Number	A(n=38)	B(n=38)	P value
Age (<60 / 60<)	24/14	18/20	0.166*
Gender (♀ / ♂)	29/9	33/5	0.237**
BMI	26.61±4.9	27.65±4.76	0.266***
Comorbidity Disease (Yes/No)	12/26	18/20	0.159*
Smoking (Ne. /Fo. /Cm.)	8/14/16	3/21/14	0.149*
Mean Pack Year	13.33±13.71	16.91±14.9	0.205***
COPD Stage (Mi. /Mo. /Se.)	13/19/6	13/19/6	0.998*

Categorical variables were tested using

^*Pearson Chi-Square Test and

^**Fisher Exact Test Continuous variables were tested using

^***Mann-Whitney U Test

Ne: Never been smoker, Fo: Former smoker, Cm: Currently smoker, Mi: Mild, Mo: Moderate, Se: Severe