Table 4.

Comparison of changes of HOAs in the different quadrants under both preoperative and postoperative settings

	Quadrants	N	Mean	Std. deviation	F	P
HT pre vs. 3 months post	1	103	0.012	0.120	2.775	0.042*
	2	85	0.028	0.097
	3	35	0.044	0.099
	4	31	−0.027	0.104
OT pre vs. 6 months post	1	51	0.042	0.102	3.535	0.016*
	2	58	−0.015	0.096
	3	24	0.020	0.089
	4	16	−0.010	0.086
SA pre vs. 3 months post	1	29	0.118	0.095	3.642	0.017*
	2	25	0.130	0.080
	3	5	−0.015	0.130
	4	5	0.097	0.076

*p < 0.05