Study of the Hearing Threshold of Dance Teachers

This study had a cross-sectional, observational, prospective, and descriptive design. Conventional and high-frequency hearing evaluations were performed with dance teachers and subjects in the control group.

Results

In all, 64 individuals were assessed, 32 in the research group and 32 in the control group. Results showed that individuals in the research group had hearing loss at frequencies between 4 and 8 kHz, but no significant difference was found between groups. Frequency analysis showed that individuals in the control group had higher thresholds than individuals in the research group at the frequency of 0.25 kHz. In the control group, men showed higher thresholds than women at the frequency of 9 kHz.

Conclusion

A low prevalence of hearing loss was found, with no difference between teachers and subjects fromthe control group. No difference was found for hearing thresholds at high frequencies between groups. Results have been partially affected by sex.

hearing; hearing loss; noise-induced; audiometry

	Study group		Control group
PTA result	n	%	n	%	p Value
Right ear
Normal hearing threshold	28	87.5	31	96.9	0.177
Hearing loss from 4 to 8 kHz	4	12.5	1	3.1	0.177
Left ear
Normal hearing threshold	27	84.4	30	93.8	0.213
Hearing loss from 4 to 8 kHz	5	15.6	2	6.3	0.213

	Control group				Study group
Frequency	Mean (SD)	Median	Trend	Min, max	Mean (SD)	Median	Trend	Min, max	p Value^a Mann-Whitney test, significance level p< 0.05.
250 Hz	13.59 (5.12)	15.00	15	5, 25	13.90 (5.64)	15.00	10	5, 25	0.878
500 Hz	12.96 (4.56)	15.00	15	5, 25	13.43 (5.3)	15.00	15	5, 25	0.631
1 kHz	8.59 (5.57)	10.00	10	0, 20	8.28 (5.33)	10.00	5	0, 20	0.758
2 kHz	6.25 (6.72)	5.00	0	−5, 20	6.41 (5.12)	5.00	5	−5, 20	0.780
3 kHz	5.31 (8.70)	5.00	0	−10, 20	6.72 (5.77)	5.00	5	−5, 25	0.173
4 kHz	5.47 (10.34)	5.00	−5	−5, 35	6.41 (10.17)	5.00	0	−5, 40	0.598
6 kHz	11.25 (10.99)	5.00	5	−5, 50	14.53 (13.93)	10.00	15	0, 60	0.335
8 kHz	6.25 (12.57)	5.00	−5	−10, 55	11.71 (15.58)	10.00	10	−10, 60	0.143
9 kHz	9.69 (12.24)	7.50	5	−10, 50	14.37 (17.26)	10.00	10	−5, 65	0.265
10 kHz	9.06 (14.61)	2.50	0	−10, 50	10.93 (18.29)	5.00	−5	−10, 70	0.838
11.2 kHz	14.21 (18.58)	7.50	5	−5, 70	14.53 (20.80)	5.00	5	−10, 75	0.973
12.5 kHz	14.53 (21.11)	10.00	5	−10, 80	13.59 (22.79)	5.00	−5	−10, 75	0.575
14 kHz	7.58 (21.12)	.00	−15	−20, 55	11.40 (26.43)	.00	−15	−15, 65	0.846
16 kHz	15.34 (23.93)	15.00	−5	−20, 60	13.92 (23.34)	10.00	10	−15, 60	0.904

	Control group				Study group
Frequency	Mean (SD)	Median	Trend	Min, max	Mean (SD)	Median	Trend	Min, max	p Value^a Mann-Whitney test, significance level p< 0.05.
250 Hz	13.28 (6.04)	15.00	15	0, 25	10.31 (5.07)	10.00	10	0, 25	0.025*
500 Hz	11.56 (4.99)	10.00	10	5, 20	10.31 (4.74)	10.00	5	5, 20	0.340
1 kHz	7.34 (6.09)	5.00	5	−5, 25	8.13 (4.71)	5.00	5	0, 20	0.501
2 kHz	5.78 (6.73)	5.00	5	−5, 20	5.16 (4.3)	5.00	5	−5, 15	0.915
3 kHz	6.72 (8.39)	5.00	5	−5, 30	5.47 (6.14)	5.00	5	−5, 25	0.846
4 kHz	7.34 (9.99)	5.00	0	−5, 30	4.84 (8.75)	5.00	0	−5, 40	0.351
6 kHz	10.78 (11.36)	10.00	5	−5, 45	14.68 (13.00)	15.00	5	0, 65	0.196
8 kHz	6.25 (10.70)	2.50	0	−5, 40	8.59 (12.65)	5.00	5	−5, 60	0.254
9 kHz	11.71 (13.53)	5.00	5	−5, 55	11.09 (16.10)	10.00	5	−20, 70	0.891
10 kHz	8.44 (15.57)	5.00	0	−10, 65	7.5 (16.89)	5.00	5	−15, 70	0.674
11.2 kHz	14.21 (19.96)	10.00	−5	−10, 85	9.52 (20.01)	5.00	5	−10, 80	0.187
12.5 kHz	13.06 (19.13)	5.00	−5	−10, 60	8.39 (19.46)	5.00	−5	−15, 75	0.277
14 kHz	10.64 (22.79)	10.00	−15	−20, 60	2.68 (18.48)	−5.00	−5	−20, 65	0.219
16 kHz	17.50 (20.02)	15	−5	−15, 60	12.59 (19.38)	10	5	−15, 55	0.384

		Study group		Control group
Frequency (Hz)	Sex	Hearing thresholds (dBHL), mean (SD)	p Value^a Mann-Whitney test.	Hearing thresholds (dBHL), mean (SD)	p Value^a Mann-Whitney test.
250	Male	11.8 (5.1)	0.12	14.5 (5.9)	0.61
250	Female	15.0 (5.7)	0.12	13.18 (4.7)	0.61
500	Male	12.7 (5.1)	0.62	13.0 (4.8)	0.96
500	Female	13.8 (5.4)	0.62	12.9 (4.5)	0.96
1,000	Male	10.4 (4.7)	0.08	9.0 (5.6)	0.86
1,000	Female	7.1 (5.3)	0.08	8.4 (5.6)	0.86
2,000	Male	7.2 (5.1)	0.53	7 (7.1)	0.78
2,000	Female	5.9 (5.1)	0.53	5.9 (6.6)	0.78
3,000	Male	6.8 (5.1)	0.84	6.5 (10.2)	0.61
3,000	Female	6.6 (6.1)	0.84	4.7 (8.0)	0.61
4,000	Male	7.7 (8.4)	0.25	9.0 (13.0)	0.33
4,000	Female	5.7 (11.1)	0.25	3.8 (8.7)	0.33
6,000	Male	12.7 (10.5)	0.84	17.0 (14.7)	0.13
6,000	Female	15.4 (15.5)	0.84	8.6 (7.8)	0.13
8,000	Male	10.0 (13.6)	0.79	12.5 (17.0)	0.11
8,000	Female	12.6 (16.7)	0.79	3.4 (9.0)	0.11
9,000	Male	16.3 (14.1)	0.34	15.0 (15.9)	0.16
9,000	Female	13.3 (18.9)	0.34	7.2 (9.6)	0.16
10,000	Male	11.8 (15.8)	0.49	14.5 (18.7)	0.24
10,000	Female	10.4 (19.8)	0.49	6.5 (12.3)	0.24
11,200	Male	16.3 (19.6)	0.64	20.5 (23.0)	0.30
11,200	Female	13.5 (21.8)	0.64	11.3 (15.9)	0.30
12,500	Male	17.2 (23.5)	0.35	21.0 (26.8)	0.36
12,500	Female	11.6 (22.7)	0.35	11.5 (17.8)	0.36
14,000	Male	14.0 (29.2)	0.78	12.7 (21.0)	0.23
14,000	Female	10.0 (25.4)	0.78	5.4 (21.2)	0.23
16,000	Male	15.5 (29.19)	>0.99	23.5 (22.3)	0.27
16,000	Female	13.5 (20.3)	>0.99	12.7 (24.3)	0.27

		Study group		Control group
Frequency (Hz)	Sex	Mean (SD)	p Value^a Mann-Whitney test.	Mean (SD)	p Value^a Mann-Whitney test.
250	Male	8.1 (4.6)	0.10	12.0 (4.8)	0.31
250	Female	11.4 (5.0)	0.10	13.8 (6.5)	0.31
500	Male	9.5 (4.1)	0.57	11.0 (3.9)	0.70
500	Female	10.7 (5.0)	0.57	11.8 (5.4)	0.70
1,000	Male	10.0 (4.4)	0.06	6.5 (6.2)	0.63
1,000	Female	7.1 (4.6)	0.06	7.7 (6.1)	0.63
2,000	Male	5.9 (5.8)	0.53	5.5 (7.6)	0.73
2,000	Female	4.7 (3.3)	0.53	5.9 (6.4)	0.73
3,000	Male	8.1 (6.4)	0.11	8.0 (9.7)	0.72
3,000	Female	4.0 (5.6)	0.11	6.1 (7.8)	0.72
4,000	Male	5.9 (6.6)	0.26	9.5 (12.3)	0.53
4,000	Female	4.2 (9.7)	0.26	6.3 (8.8)	0.53
6,000	Male	12.2 (7.1)	0.79	14.5 (16.9)	0.52
6,000	Female	15.9 (15.2)	0.79	9.0 (7.6)	0.52
8,000	Male	8.1 (10.5)	0.79	11.0 (15.5)	0.33
8,000	Female	8.8 (13.8)	0.79	4.0 (7.0)	0.33
9,000	Male	15.4 (13.2)	0.08	20.5 (16.4)	0.016*
9,000	Female	8.8 (17.3)	0.08	7.7 (10.0)	0.016*
10,000	Male	11.3 (15.1)	0.10	16.5 (21.8)	0.12
10,000	Female	5.4 (17.7)	0.10	4.7 (10.4))	0.12
11,200	Male	14.0 (19.8)	0.14	23.0 (27.4)	0.21
11,200	Female	7.0 (20.1)	0.14	10.2 (14.5)	0.21
12,500	Male	14.5 (25.9)	0.24	20.0 (22.5)	0.21
12,500	Female	5.0 (14.5)	0.24	10.2 (17.3)	0.21
14,000	Male	8.0 (24.8)	0.48	20.0 (26.6)	0.16
14,000	Female	10.0 (13.7)	0.48	6.8 (20.4)	0.16
16,000	Male	7.2 (20.1)	0.18	25.0 (19.5)	0.32
16,000	Female	15.2 (18.9)	0.18	15.0 (20.0)	0.32

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[TFN01] Abbreviation: PTA, pure tone audiometry.