Table 3.

Comparison of postoperative S2-PD in four groups [(x±s)/mm]

Group	N	One month post-op	Six month post-op	One year post-op	F1	P1
A	27	13.30±1.30	11.93±1.54*	10.52±1.89#	20.496	0.000
B	23	13.13±1.06	12.13±0.81*	11.22±0.67#	28.288	0.000
C	26	13.15±1.38	10.27±1.48*	8.00±1.20#	93.939	0.000
D	30	13.00±1.20	6.83±1.23	5.10±0.88	413.325	0.000
F2	-	0.271	123.880	277.718
P2	-	0.846	0.000	0.000

P1: analysis and comparison of two-point discrimination sense in different time after the same operation. P2: analysis and comparison of two-point discrimination sense in the same operation time after the same operation.

^*indicates S2-PD at 6 months vs Group D, P2 < 0.01.

^#indicates S2-PD at one year vs Group D, P2 < 0.01.