TABLE III.

Mean Pure Tone Thresholds by Diabetes Severity, Youngest Age Tertile (27–49 Years).

	Right Ear (n = 115)
	No Diabetes (n = 49)		NIDDM (n = 35)		IDDM (n = 31)
Pure Tone Threshold	Mean	SD	Mean	SD	Mean	SD
250	8.57	6.46	11.43	6.25	13.71*	7.41
500	10.20	6.29	16.29†	7.61	17.26†	6.69
1,000	10.82	5.81	16.14†	6.54	14.52‡	5.82
1,500	10.82	6.48	16.14‡	7.48	13.55	6.73
2,000	12.86	7.30	17.29‡	7.70	15.16	9.08
3,000	13.88	6.87	21.14*	13.07	18.23	11.30
4,000	16.43	15.68	24.43‡	17.14	18.87	11.95
6,000	19.29	15.84	24.00	18.30	20.00	13.35
8,000	16.94	17.91	22.43	18.96	21.45	17.14
10,000§	24.29	21.16	36.14‡	23.67	37.90‡	20.07
12,500§	31.73	22.65	45.00‡	27.03	45.81‡	19.07
14,000§	41.73	22.58	51.42	26.89	56.13‡	17.69
	Left Ear (n = 115)
	No Diabetes (n = 49)		NIDDM (n = 35)		IDDM (n = 31)
Pure Tone Threshold	Mean	SD	Mean	SD	Mean	SD
250	9.49	6.31	14.86†	5.88	14.19*	7.21
500	10.33	6.19	17.43†	6.23	16.13*	7.04
1,000	11.43	6.29	17.57†	5.99	13.23	7.02
1,500	10.31	7.67	17.57†	6.68	13.23	7.02
2,000	13.47	7.45	19.43*	8.02	15.00	7.42
3,000	16.53	11.65	24.00‡	13.33	17.90	11.46
4,000	21.22	15.80	31.00‡	18.46	20.32	11.90
6,000	21.73	15.76	29.09	19.02	20.65	12.02
8,000	18.78	17.06	25.00	17.86	21.29	16.78
10,000§	24.90	21.47	37.29‡	24.17	34.52	21.38
12,500§	35.71	24.45	46.71	26.79	46.13	23.12
14,000§	42.55	24.77	53.14	23.17	53.71	17.93

^*P ≤ .01 compared to no diabetes.

^†P ≤ .001 compared to no diabetes.

^‡P ≤ .05 compared to no diabetes.

^§Thresholds placed at limits of equipment +5 dB.

NIDDM = noninsulin-dependent diabetes mellitus; IDDM = insulin-dependent diabetes mellitus; SD = standard deviation.