TABLE 3.

Comparison of auditory and neuro-electrophysiological results between patients with typewriter tinnitus and controls with idiopathic unilateral tinnitus

Valuables	Sensorineural Tinnitus (n = 38)	Typewriter Tinnitus (n = 18)	p
Age (mean ± SD, y)	45.2 ± 13.8	49.4 ± 13.6	0.282
Gender (n, %)
Male	19 (50.0)	7 (38.9)	0.436
Female	19 (50.0)	11 (61.1)
Duration of tinnitus	1.0 (0.4–5.0)	0.7 (0.3–1.1)	0.122
Lateral (n, %)
Left	23 (60.5)	8 (44.4)	0.258
Right	15 (39.5)	10 (55.6)
PTA (median[IQR], dB HL)	17.5 (11.3–28.8)	16.3 (10.9–27.8)	0.752
ABR
I wave latency (median[IQR], ms)	1.7 (1.6–1.7)	1.7 (1.6–1.7)	0.209
III wave latency (median[IQR], ms)	3.8 (3.7–3.9)	4.1 (4.0–4.3)	<0.001 *
V wave latency (median[IQR], ms)	5.7 (5.6–5.8)	5.9 (5.8–6.1)	0.003 *
IPL I-III (median[IQR], ms)	2.2 (2.1–2.3)	2.4 (2.3–2.5)	<0.001 *
IPL III-V (mean ± SD, ms)	1.9 ± 0.1	1.8 ± 0.1	0.055
IPL I-III ≥2.3 ms (n, %)
No	35 (92.1)	0 (0.0)	<0.001 *
Yes	2 (5.3)	18 (100.0)
Absent response	1 (2.6)	0 (0.0)

^*P<0.05.

ABR, auditory brainstem response; IPL, interpeak latency; IQR, interquartile range; PTA, pure-tone audiometry; SD, standard deviation.