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. 2020 Jul 31;15(7):e0236723. doi: 10.1371/journal.pone.0236723

Table 2. Results of pure-tone audiometry according to tinnitus symptom.

		Right (mean ± SE)				Left (mean ± SE)
		Normal (n = 838)	Mild tinnitus (n = 601)	Severe tinnitus (n = 154)	P^a	Normal (n = 838)	Mild tinnitus (n = 601)	Severe tinnitus (n = 154)	P^a
Average	Speech^b	8.7 ± 0.2	8.8 ± 0.2	8.6 ± 0.4	0.707	7.4 ± 0.2	7.6 ± 0.2	7.3 ± 0.6	0.459
Average	High^c	4.8 ± 0.1	4.9 ± 0.1	4.5 ± 0.3	0.232	4.3 ± 0.1	4.5 ± 0.1	4.2 ± 0.4	0.371
Frequency	0.5 kHz	10.9 ± 0.4	10.3 ± 0.3	10.8 ± 0.5	0.177	9.9 ± 0.3	10.2 ± 0.4	10.5 ± 0.6	0.437
	1 kHz	8.0 ± 0.2	8.4 ± 0.3	7.8 ± 0.4	0.263	6.4 ± 0.2	6.5 ± 0.3	6.0 ± 0.6	0.478
	2 kHz	7.2 ± 0.2	7.8 ± 0.2	7.1 ± 0.5	0.041	5.9 ± 0.2	6.2 ± 0.2	5.5 ± 0.6	0.169
	3 kHz	6.8 ± 0.2	6.8 ± 0.2	6.4 ± 0.5	0.642	5.8 ± 0.2	6.4 ± 0.2	5.9 ± 0.4	0.164
	4 kHz	7.9 ± 0.3	7.9 ± 0.3	6.8 ± 0.5	0.118	6.7 ± 0.2	6.7 ± 0.3	6.4 ± 0.9	0.828
	6 kHz	2.1 ± 0.1	2.1 ± 0.1	2.2 ± 0.2	0.586	2.1 ± 0.1	2.2 ± 0.1	2.0 ± 0.2	0.439
	8 kHz	2.6 ± 0.1	2.6 ± 0.1	2.4 ± 0.2	0.571	2.6 ± 0.1	2.7 ± 0.1	2.5 ± 0.2	0.687

^a Analysis of variance was performed because of the complex structure of the survey.

^b Pure tone averages of 0.5, 1, and 2 kHz

^c Pure tone averages of 3, 4, 6, and 8 kHz