Table 2. Differences between mean auditory thresholds at different frequencies in dB at no noise condition.

Frequency (Hz)	0.1 kHz	0.5 kHz	1 kHz	1.5 kHz	2 kHz	4 kHz
0.1 kHz	–	4.0	6.2	10.9	4.3	12.3
0.5 kHz	4.0	–	2.2	6.9	0.3	16.3
1 kHz	6.2	2.2	–	4.7*)	1.9	18.5
1.5 kHz	10.9	6.9	4.7*)	–	6.6	23.2
2 kHz	4.3	0.3	1.9	6.6	–	16.6
4 kHz	12.3	16.3	18.5	23.2	16.6	–

Notes.

Bold numbers: significant differences between thresholds. *) one-tailed.