Table 1.

Demographic characteristics of patients

Characteristics	Control (n=100)	Case (n=100)	P
Age (year)	34.24±4.06	33.61±0.76	0.341*
BMI (kg/m2)	26.21±6.56	27.36±6.01	0.875*
Past medical history (%)	6 (6)	5 (5)	0.767**

*Using independent sample test for mean age and BMI comparing two groups, **Using Fisher’s exact test for the frequency distribution past medical history of comparing two groups. BMI: Body mass index