Table 2. Demographic Characteristics of Participants.

Characteristics		RFCBT group n( %)	Control group n( %)	χ 2	P-value
Age,y	20-30 31-40 41-50 51-55	2 (6.6) 3 (10) 5 (16.6) 5 (16.6)	3 (10) 4 (13.3) 4 (13.3) 4 (13.3)	0.565	0.901
Education level	High school Bachelor Master	4 (13.3) 8 (23.6) 3 (10)	3 (10) 9 (30) 3 (10)	0.202	0.914
Sex	Female Male	11 (36.6) 4 (13.3)	10 (33.3) 5 (16.6)	0.159	0.69