Table 1.

(A) Mean auditory brainstem response (ABR) thresholds (dB SPL) for the four CBA mouse groups, and (B) mean distortion product otoacoustic emission (DPOAE) amplitudes (dB SPL) for the same four subject groups

	Young	Middle-age	Old mild HL	Old severe HL
(A)
ABR/3 kHz	53.3	64.4	78.9	85.0
ABR/6 kHz	26.1	33.2	58.3	73.3
ABR/12 kHz	8.3	15.3	37.8	48.3
ABR/24 kHz	14.4	21.5	45.0	66.7
ABR/32 kHz	21.1	30.6	59.4	71.7
ABR/48 kHz	25.0	35.3	67.8	73.3
(B)
DPOAE/5,600 Hz	0.7	4.7	1.4	−8.5
DPOAE/6,107 Hz	1.7	5.5	−9.8	−21.7
DPOAE/6,660 Hz	12.5	13.7	4.9	−18.5
DPOAE/7,262 Hz	12.2	13.1	2.7	−21.0
DPOAE/7,920 Hz	21.9	23.1	8.1	−14.9
DPOAE/8,636 Hz	17.4	17.5	2.7	−19.0
DPOAE/9,418 Hz	20.8	20.8	10.0	−15.5
DPOAE/10,270 Hz	24.9	25.3	10.5	−13.7
DPOAE/11,200 Hz	22.0	21.4	8.0	−15.1
DPOAE/12,214 Hz	19.2	22.2	14.8	−3.9
DPOAE/13,319 Hz	32.0	31.1	22.3	−0.4
DPOAE/14,525 Hz	27.6	26.7	16.8	−11.2
DPOAE/15,839 Hz	21.8	25.5	9.9	−18.3
DPOAE/17,273 Hz	24.1	25.6	10.3	−21.0
DPOAE/18,836 Hz	30.3	27.9	11.2	−18.2
DPOAE/20,541 Hz	21.0	20.6	7.1	−15.3
DPOAE/22,400 Hz	15.2	14.5	3.5	−19.4
DPOAE/24,427 Hz	6.7	6.0	−5.4	−21.5
DPOAE/26,638 Hz	8.0	5.9	−13.8	−22.6
DPOAE/29,049 Hz	20.1	18.8	10.3	−19.1
DPOAE/31,678 Hz	16.0	14.1	1.0	−21.2
DPOAE/34,546 Hz	10.1	7.9	−2.5	−23.1
DPOAE/37,672 Hz	11.2	7.7	2.2	−22.1
DPOAE/41,082 Hz	10.1	4.9	−7.2	−23.6
DPOAE/44,800 Hz	12.3	8.0	−0.8	−19.8