Table 1.

Clinical criteria for definition of hearing response based on a 50-word hearing test

Baseline word recognition score (%)	95% critical difference (%)	Hearing response (%)	Progressive disease (%)
0	0–4	≥6	n/a
2	0–10	≥12	n/a
4	0–14	≥16	n/a
6	2–18	≥20	0
8	2–22	≥24	0
10	2–24	≥26	0
12	4–26	≥28	≤2
14	4–30	≥32	≤2
16	6–32	≥34	≤4
18	6–34	≥36	≤4
20	8–36	≥38	≤6
22	8–40	≥42	≤6
24	10–42	≥44	≤8
26	12–44	≥46	≤10
28	14–46	≥48	≤12
30	14–48	≥50	≤12
32	16–50	≥52	≤14
34	18–52	≥54	≤16
36	20–54	≥56	≤18
38	22–56	≥58	≤20
40	22–58	≥60	≤20
42	24–60	≥62	≤22
44	26–62	≥64	≤24
46	28–64	≥66	≤26
48	30–66	≥68	≤28
50	32–68	≥70	≤30
52	34–70	≥72	≤32
54	36–72	≥74	≤34
56	38–74	≥76	≤36
58	40–76	≥78	≤38
60	42–78	≥80	≤40
62	44–78	≥80	≤42
64	46–80	≥82	≤44
66	48–82	≥84	≤46
68	50–84	≥86	≤48
70	52–86	≥88	≤50
72	54–86	≥88	≤52
74	56–88	≥90	≤54
76	58–90	≥92	≤56
78	60–92	≥94	≤58
80	64–92	≥94	≤62
82	66–94	≥96	≤64
84	68–94	≥96	≤66
86	70–96	≥98	≤68
88	74–96	≥98	≤72
90	76–98	100	≤74
92	78–98	100	≤76
94	82–98	100	≤80
96	86–100	n/a	≤84
98	90–100	n/a	≤88
100	96–100	n/a	≤94

Upper and lower limits for the 95% critical differences for percentage scores (second column). Changes in word recognition within the 95% critical difference are not statistically different from the baseline score. In use, third (for improved hearing) or fourth (for decreased hearing) columns are compared to baseline scores in first column. Adapted from Thornton and Raffin [147]