Table 3.

HHS before surgery and follow-up

Time points	Groups (HHS Median [percentile25-percentile75])				Overall
	Stage II	Stage III	Type C1	Type C2
Pre-op	59 (56–61)	53 (46–56)	57 (52–61)	61 (55–63)	59 (55–61)
24 ms	86 (83–90) **	79 (68–84) **, ¶¶	86 (82–90) **	68 (61–83) ¶¶	85 (79–90) **
60 ms	89 (88–91) **	90 (78–91) **	90 (87–91) **	82 (65–88) ¶	89 (86–91) **
96 ms	94 (90–96) **	92 (90–95) **	94 (91–96) **	89 (70–94) *	94 (91–96) **

^**: Significant difference compared to pre-op HHS score in each group (P < 0.01); *: Significant difference compared to pre-op HHS score in each group (P < 0.05)

^¶: Significant difference compared to stage II / Type C1 at the same time point (P < 0.05)

^¶¶: Significant difference compared to stage II / Type C1 at the same time point (P < 0.01)