Table 2. Gender and age ranges of the three groups of research subjects.

		Patient group		Negative control		Normal control
		n	%	n	%	n	%
Gender	Male	11	55.00	8	40.00	10	50.00
	Female	9	45.00	12	60.00	10	50.00
Age (years)	20-40	4	20.00	5	25.00	4	20.00
	40-60	7	35.00	8	40.00	8	40.00
	>60	9	45.00	7	35.00	8	40.00