Table 1.

Comparison of clinical data between the two groups (x̅ ± sd)

Group	Gender (n)		Age (years)	BMI (kg/m2)	Smoking history (n)	Course of disease (years)
	Male	Female
Observation group (n=42)	22	20	50.4±3.1	22.09±2.33	19	2.5±1.1
Control group (n=42)	21	21	51.1±3.0	22.11±2.27	22	2.7±0.9
t/χ2	0.048		1.052	0.040	0.429	0.912
P	0.927		0.296	0.968	0.512	0.364

Note: χ² is the statistical value of Chi-square test; t is the statistical value of t test. BMI: body mass index.