Table A2.

Cumulative Incidence of Hearing Loss by Frequency and Ear

Frequency, Hz	Cumulative Incidence of Hearing Loss
	Total No. of Patients	Right Ear				Left Ear
		Year 5		Year 10		Year 5		Year 10
		Estimate (%)	SE	Estimate (%)	SE	Estimate (%)	SE	Estimate (%)	SE
250	72	0	0	0	0	0	0	0	0
500	73	0	0	0	0	4.0	2.8	4.0	2.8
1,000	73	4.1	2.9	4.1	2.9	4.0	2.8	4.0	2.8
2,000	72	5.7	3.3	5.7	3.3	1.6	1.6	1.6	1.6
3,000	71	2.4	2.4	2.4	2.4	0	0	0	0
4,000	73	4.1	2.9	4.1	2.9	1.6	1.6	1.6	1.6
6,000	73	2.4	2.4	5.3	3.7	1.6	1.6	1.6	1.6
8,000	73	2.5	2.5	5.5	3.8	0	0	0	0