Table 1.

Summary statistics for behavioral threshold measurements of test duration and threshold variability using maximum-likelihood yes–no task for normal and SNHL groups of subjects (1 ear per subject).

		Duration (s)			SD of threshold (dB)
Frequency (kHz)	N	Block 1 mean	Block 1 SD	Total	(Average across ears)
Normal subjects (group mean PTA = 5 dB HL, SD = 3 dB)
0.5	20	112	15	129	2.60
1	20	117	17	117	1.62
2	20	114	12	125	1.25
4	20	113	13	138	1.38
5	20	116	18	116	1.52
6	20	119	35	127	1.73
8	20	117	25	123	1.33
10.1	20	121	39	141	1.06
12.7	20	118	14	137	1.47
16	18	121	34	150	1.66
Median (0.5–12.7)		117	17	127	1.47
IQR (0.5–12.7)		4.3	11.3	14.2	0.29
SNHL subjects (group mean PTA = 72 dB HL, SD = 9 dB)
0.5	19	122	15	154	1.15
1	20	172	98	177	1.67
2	14	123	15	141	0.92
4	13	118	15	127	0.80
5	12	118	12	146	1.12
6	12	118	38	118	1.55
8	11	120	13	174	1.57
10.1	8	120	14	120	1.11
12.7	2	133	4	133	1.45
16	0	NR	NR	NR	NR
Median (0.5–12.7)		120	15	141	1.15
IQR (0.5–12.7)		4.4	1.9	26.7	0.44
	111

^aN = Number of subjects out of 20 with threshold in measurement range.

^bBlock 1 mean = Mean duration in first block of three trials.

^cBlock 1 SD = SD of duration in first block of three trials.

^dTotal = Mean total duration across all blocks of trials needed for each subject.

^eSD of threshold = SD of threshold (dB HL) averaged over N subjects.

^fMedian = Median of each column variable across frequencies 0.5–12.7 kHz.

^gIQR = Inter-quartile range of each column variable across 0.5–12.7 kHz.

^hNotes: Medians and IQRs were calculated from 0.5 to 12.7 kHz because the SNHL group had no subjects with data at 16 kHz. Except for the Block 1 SD, the normal group responses at 16 kHz were within the IQR of the medians between 0.5 and 12.7 kHz.