Table 4. The patients time of follow-up by groups.

Time of follow-up (months)	Group A		Group B		Total
	No.	%	No.	%	No.	%
12	17	41.5	24	42.9	41	42.3
18	18	43.9	21	37.5	39	40.2
24	6	14.6	11	19.6	17	17.5
Total	41	100.0	56	100.0	97	100.0
Mean time of follow-up	16.4	-	16.6	-	16.5	-
SD	4.2	-	4.5	-	4.4	-
VC	25.6	-	27.3	-	26.6	-
T test=0.22; DF=95; P=0.82