Table 2 Contralateral suppression (CS) of DPOAE amplitudes in dB SPL according to 2f1-f2 in tinnitus patients and control group

818(f1) 1001(f2)

 Min.–max.

− 15.80 to 10.80

− 3.40 to 11.50

297.00*

0.024*

 Mean ± SD.

1.58 ± 6.82

5.08 ± 4.18

 Median

3.90

6.15

1038(f1) 1257(f2)

 Min.–max.

− 15.90 to 12.70

− 6.10 to 10.90

305.00*

0.032*

 Mean ± SD.

1.06 ± 7.21

4.86 ± 4.77

 Median

1.80

6.20

1306(f1) 1587(f2)

 Min.–max.

− 13.40 to 14.20

− 10.20 to 14.50

264.00*

0.006*

 Mean ± SD.

0.78 ± 6.62

5.55 ± 5.92

 Median

1.65

7.60

1636(f1) 2002(f2)

 Min.–max.

− 28.90 to 11.40

− 8.70 to 15.60

240.50*

0.002*

 Mean ± SD.

− 1.03 ± 8.74

5.47 ± 6.09

 Median

0.55

6.55

2063(f1) 2515(f2)

 Min.–max.

− 20.0 to 10.20

− 9.90 to 15.20

241.00*

0.002*

 Mean ± SD.

− 1.42 ± 7.37

4.86 ± 6.34

 Median

0.10

5.20

2600(f1) 3174(f2)

 Min.–max.

− 13.40 to 10.10

− 13.40 to 12.70

241.00*

0.002*

 Mean ± SD.

− 1.44 ± 5.75

3.51 ± 6.74

 Median

− 2.85

5.25

3284(f1) 4004(f2)

 Min.–max.

− 14.20 to 11.80

− 19.0 to 11.20

183.00*

< 0.001*

 Mean ± SD.

− 0.86 ± 6.42

4.72 ± 6.61

 Median

0.90

5.95

4126(f1) 5042(f2)

 Min.–max.

− 16.50 to 19.10

− 2.0 to 16.90

305.5*

0.033*

 Mean ± SD.

5.67 ± 8.55

10.08 ± 3.88

 Median

4.20

10.15

5200(f1) 6348(f2)

 Min.–max.

− 20.90 to 10.10

− 33.50 to 8.60

213.00*

< 0.001*

 Mean ± SD.

− 11.03 ± 9.32

− 1.59 ± 10.0

 Median

− 15.70

1.65