. 2017 Jul 7;11:384. doi: 10.3389/fnins.2017.00384

Table 1.

Overview of participant groups and tinnitus parameters.

	TG (n = 18)	PTC (n = 21)	AC (n = 22)	Statistics
Tinnitus causation [acute hearing loss/noise trauma/distress/other] (n)	1/7/6/4	2/6/8/5		χ²_{(df = 1)} = 0.489 p = 0.484
Type of tinnitus [tonal/non-tonal] (n)	10/8	12/9		$χ_{(d f = 1)}^{2}$ = 0.170 p = 0.680
Tinnitus frequency (Hz) [mean (SD)]	5,112 (2,382)	6,369 (3,193)		t_{(df = 41)} = −1.469 p = 0.154
Tinnitus localisation [right/left/bilateral/not determinable] (n)	5/7/4/2	4/8/5/4		χ²_{(df = 1)} = 0.146 p = 0.703
TQ score from initial anamnestic diagnostics [mean (SD)]	38.50 (15.4)	36.20 (16.82)		t_{(df = 41)} = 0.737 p = 0.465
Tinnitus duration up to initial anamnestic diagnostics (T₀) (weeks) [mean (SD)]	5.10 (2.14)	4.63 (2.01)		t_{(df = 41)} = 0.567 p = 0.575
Tinnitus duration up to start of therapy (T₁) (weeks) [mean (SD)]	8.14 (1.85)	8.10 (1.45)		t_{(df = 41)} = 0.082 p = 0.935
Patients' age (years) [mean (SD)]	43.9 (10.4)	42.6 (11.5)	38.9 (14.0)	Kruskal–Wallis test χ²_{(df = 2)} = 1.54 p = 0.464
Patients' sex [male/female] (n)	10/8	13/8	12/10	χ²_{(df = 2)} = 0.273 p = 0.873