Table 6. Rank variance analysis of AFS score reduction (part I).

Variables	Control group	Study group	P value
Preoperative AFS score			0.0969
Mean ± SD	8.58±1.68	9.12±1.59
Median [min, max]	8.0 [5, 12]	10.0 [6, 12]
Postoperative AFS score			<0.0001*
Mean ± SD	6.35±2.89	4.97±2.53
Median [min, max]	6 [2, 12]	5 [0, 12]
AFS score reduction			<0.0001*
Mean ± SD	3.05±2.21	4.71±2.05
Median [min, max]	3 [−2, 9]	5 [0, 10]