Table 2.

Tinnitus scores in participants with preoperative tinnitus.

Participant	Group	THI score					TQ score
		Pre	1-yr	2-yr	3-yr	Δ1-yr BiCI	Pre	1-yr	2-yr	3-yr	Δ1-yr BiCI
1	sim	4	0	0	0	Total ↓	8	0	0	0	Total ↓
2	sim	22	14	14	12	↓	24	11	13	11	↓
3	sim	22	2	0	4	↓	20	3	1	1	↓
4	sim	28	0	0	0	Total ↓	41	4	2	0	↓
5	sim	46	28	30	52	↓	30	18	26	34	↓
6	sim	14	18	18	18	=	17	26	29	29	↑
7	sim	0	0	0	0	No tinnitus	1	0	0	2	Total ↓
8	sim	48	22	28	28	↓	16	9	18	13	↓
9	sim	12	12	4	12	=	23	15	10	21	↓
10	seq	32	6	10	8	↓	33	7	10	7	↓
11	seq	2	0	0	0	Total ↓	7	7	1	0	Total ↓
12	seq	18	0	8	0	Total ↓	6	8	17	0	Total ↓
13	seq	8	6	4	6	=	17	21	7	8	↓
14	seq	10	4	0	2	↓	24	5	8	7	↓
15	seq	2	2	Missing	Missing	Missing	0	4	Missing	Missing	Missing
16	seq	4	0	0	Missing	Missing	0	0	0	Missing	Missing
Median (IQR)	total	13 (4–27)	3 (0–14)	4 (0–14)	5 (0–14)	−8a (−28 to 4)	17 (6–24)	7 (3–14)	8 (1–17)	7 (0–15)	−9a (−17 to −9)
Median (IQR)	sim	22 (8–37)	12 (0–20)	4 (0–23)	12 (0–23)	−8a (−23 to 0)	20 (12–27)	9 (2–17)	10 (1–22)	11 (1–25)	−8a (−15 to −4)
Median (IQR)	seq	8 (2–18)	2 (0–6)	2 (0–9)	2 (0–7)	−8a (−21 to −2)	7 (0–24)	7 (4–8)	7.5 (1–2)	7 (0–1)	−9a (−22 to −7)

THI, Tinnitus Handicap Inventory; TQ, Tinnitus Questionnaire; pre, preoperative; 1-yr, follow-up year 1; 2-yr, follow-up year 2; 3-yr, follow-up year 3; sim, simultaneous group; seq, sequential group; IQR, inter-quartile range; Δ1-yr BiCI, change in tinnitus 1 year after bilateral cochlear implantation (follow-up year 1 simultaneous group, follow-up year 3 sequential group); total ↓, total suppression; ↓, decrease; =, stable; ↑, increase. A score of 0 indicated “no tinnitus.”

^aMedian difference score = tinnitus score 1 year after bilateral cochlear implantation minus preoperative score.