Table 1.

Average audiometric thresholds at different octave frequencies and corresponding ranges for the three listener groups.

	AudiometricThreshold	Left Ear						Right Ear
	(dB HL)	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
YNH	Mean	4.5	5	6.5	7	7.5	10	4	5	5.5	6	7	9.5
	Range	0–15	0–15	−5–15	−5–10	0–20	0–20	0–10	−5–10	−5–15	0–10	0–15	0–20
ONH	Mean	8.57	8.92	9.64	10.00	17.50	31.43	7.14	8.21	9.29	9.64	18.93	32.86
	Range	0–15	5–15	0–20	0–20	5–25	10–70	0–15	0–15	5–20	0–25	5–25	10–60
OHI	Mean	22.50	25.83	27.50	29.17	40.00	52.08	20.83	26.67	26.67	29.17	40.82	53.75
	Range	10–25	15–35	15–30	10–40	10–60	25–80	10–25	10–40	15–30	10–40	20–60	25–80