Table 2 Characteristics of patients included in the study.

Sex	Age (years)	Tumor diameter(mm)^a	PTA4 tumor ear^b	PTA4 contra-lateral ear^b	Difference in PTA4^b	Hearing group	Tumor type
F	52	25	5	5	0	1	Meningioma
F	34	30	9	8	1	1	VS
F	45	18	9	9	0	1	VS
M	45	31	10	10	0	1	VS
M	37	17	13	5	8	1	VS
F	44	32	15	1	14	1	Meningioma
F	42	18	15	5	10	1	VS
M	57	33	15	10	5	1	Meningioma
F	55	19	16	1	15	1	VS
M	41	44	19	3	16	1	VS
M	26	19	24	4	20	1	VS
F	55	40	26	18	8	1	VS
M	49	18	26	6	20	1	VS
F	50	6	29	19	10	1	VS
F	35	25	30	11	19	1	VS
F	56	20	34	4	30	1	VS
M	45	37	35	5	30	2	VS
F	35	27	36	8	28	2	VS
M	17	20	48	3	45	2	VS
F	65	19	50	38	12	2	VS
M	55	24	51	39	12	2	VS
F	62	37	51	11	40	2	VS
M	29	25	52	5	47	2	VS
M	31	27	58	10	48	2	VS
M	41	40	61	33	28	2	VS
F	59	30	61	8	53	2	VS
M	55	27	62	5	57	2	VS
F	71	31	63	44	19	2	VS
F	64	16	73	21	52	3	VS
M	46	13	79	13	66	3	VS
M	61	23	81	8	73	3	VS
M	53	22	83	38	45	3	VS
M	72	28	84	30	54	3	VS
M	60	11	110	9	101	3	VS
M	65	27	x	x	x	x	VS

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