TABLE II.

Regression parameters for estimating hearing thresholds from EDPTs [Eq. (7)] for both stimulus paradigms. DPOAE I/O functions were subjected to high-level correction (HLC; Sec. II E). f₂: Stimulus frequency and, in the case of DPOAEs, the frequency of the second primary tone. Parameters are pooled across frequency, denoted by the row label “1,…,8,” and also partitioned and pooled across frequency according to the absence or presence of fine structure (FS) at L₂ = 45 dB SPL, denoted by the row labels “no FS” and “FS,” respectively. N_a: Number of accepted EDPTs (Sec. II E, and Table I). $r^2$: Squared correlation coefficient [Eq. (7)]. ${\sigma }_{\Delta L}$: Standard deviation of the differences between $L_{\mathit{E}\mathit{H}\mathit{T}}$ [Eq. (7)] and $L_{\mathit{B}\mathit{T}}$. $a$ and $b$: Slope and constant parameters of the linear regression line [Eq. (7)]. All correlations were significant (p < 0.001), except for short-pulse EDPTs at f₂ = 1 kHz (p = 0.07) and 8 kHz (p = 0.22). For both stimulus paradigms, at f₂ = 1 and 8 kHz, the slope values are those from the pooled data (row label “1,…,8”) because of limited dynamic range in the DPOAE I/O function at these two frequencies.

	Short-pulse DPOAE					Continuous DPOAE
$f_2$ (kHz)	Na	$r^2$	${\sigma }_{\Delta L}$ (dB)	a	b (dB SPL)	Na	$r^2$	${\sigma }_{\Delta L}$ (dB)	a	b (dB SPL)
1	27	0.13	6.94	(0.90 ± 0.04)	−7.67 ± 1.35	35	0.33	7.07	(0.93 ± 0.05)	−7.36 ± 1.21
1.5	34	0.58	5.58	0.66 ± 0.10	−0.49 ± 2.88	35	0.57	7.44	0.80 ± 0.12	−1.15 ± 3.30
2	39	0.74	5.82	1.00 ± 0.10	−8.63 ± 3.23	38	0.76	5.60	1.00 ± 0.10	−5.36 ± 2.79
3	35	0.79	4.93	0.96 ± 0.09	−7.51 ± 2.71	32	0.60	7.01	0.80 ± 0.12	0.76 ± 3.38
4	36	0.67	6.83	1.02 ± 0.12	−8.54 ± 4.17	39	0.77	6.92	1.09 ± 0.10	−7.00 ± 3.29
5	32	0.63	6.37	0.97 ± 0.14	−4.05 ± 4.84	34	0.58	6.96	1.04 ± 0.16	−1.83 ± 5.02
6	32	0.60	5.93	0.82 ± 0.13	0.04 ± 4.61	32	0.66	6.09	1.32 ± 0.17	−11.35 ± 5.51
8	19	0.09	7.95	(0.90 ± 0.04)	−2.92 ± 1.87	31	0.36	8.82	(0.93 ± 0.05)	0.75 ± 1.60
1,…,8	254	0.64	6.52	0.90 ± 0.04	−4.9 ± 1.37	276	0.60	7.60	0.93 ± 0.05	−2.11 ± 1.37
no FS	135	0.67	6.45	0.92 ± 0.06	−5.32 ± 1.83	157	0.69	7.11	1.02 ± 0.05	−4.91 ± 1.70
FS	119	0.60	6.61	0.88 ± 0.07	−4.26 ± 2.08	119	0.42	8.04	0.78 ± 0.08	2.09 ± 2.30