Table 1. Average audibility thresholds for both ears.

	250Hz	500Hz	1KHz	2KHz	3KHz	4KHz	6KHz	8KHz
Mean	22.8	20.8	17.3	20.8	24.3	33.5	36.9	33.4
SD	11.0	10.8	11.8	16.8	17.2	21.4	22.1	25.5
Median	20	20	15	20	20	30	35	30
Minimum	5	5	5	0	0	5	0	0
Maximum	65	60	65	85	80	100	100	95
n=81

SD: standard deviation.