Audiogram Age Correction: When OSHA's Appendix F Applies

What is audiogram age correction?

Age correction is an optional adjustment under Appendix F to 29 CFR 1910.95 that accounts for the hearing loss a person would experience from aging alone, separate from noise exposure at work. OSHA publishes age-correction tables broken out by sex and age, listing the expected decibel decline at each test frequency for someone of a given age with no occupational noise exposure. An employer who elects to use age correction subtracts the applicable value from an employee's current-year threshold at each frequency before comparing it to baseline — the goal is to isolate how much of an observed shift is presbycusis (age-related loss) versus how much is attributable to noise on the job.

When does Appendix F actually apply?

Appendix F applies specifically to the standard threshold shift (STS) calculation described in 1910.95(g)(10)(ii) — it is not part of every audiogram review. It comes into play when an employer has elected, as a program-wide policy, to apply age correction before determining whether an employee's audiogram shows a 10 dB average shift at 2000, 3000, and 4000 Hz relative to baseline. It does not apply to the initial decision of whether a shift occurred in raw terms, and it does not change the baseline audiogram itself — the baseline stays as originally recorded. Age correction only adjusts the comparison used for the STS trigger.

How does the age-correction table work?

Appendix F provides two tables, one for men and one for women, each listing expected age-related threshold values in decibels at 1000, 2000, 3000, 4000, and 6000 Hz for ages 20 through 60+. To apply the correction, an employer looks up the tabled value for the employee's age at baseline and their age at the current test, at each relevant frequency, and subtracts the difference between those two values from the observed threshold shift. Because the tables assign larger expected declines to older age brackets, the correction tends to reduce the apparent shift more for older workers — someone tested at 55 gets a bigger age allowance than someone tested at 30.

Element	Applies	Does not apply
STS 10 dB average calculation	Yes, if elected	—
Baseline audiogram value	—	Baseline stays unadjusted
OSHA 300 Log recordability (1904.10)	—	Age correction is not used here
Individual audiogram diagnosis	—	Not a diagnostic tool, statistical only

Is age correction mandatory?

No. 1910.95 leaves the decision to the employer, but the appendix is explicit that if age correction is used, it has to be applied consistently to the whole workforce rather than selectively to individual employees whose results would benefit from it. A program can't apply age correction only to cases where it would prevent an STS from being recorded while skipping it for employees where it wouldn't matter — that selective application would undermine the statistical basis for the correction and expose the program to a legitimate challenge on inconsistency grounds.

How does age correction change a borderline STS?

Take an employee whose raw three-frequency average shift is 10.5 dB — without correction, that's a confirmed STS requiring notification and follow-up. If Appendix F tables assign a combined age allowance across those three frequencies that lowers the average by 1.5 dB, the corrected shift drops to 9 dB, below the STS threshold, and the case is not recorded as a shift for that testing cycle. This is the practical reason age correction matters to program administrators: it can be the difference between a case that requires written notification, refitting, and possible referral, and one that doesn't, for the exact same raw audiogram data.

How does Foster apply age correction consistently?

Foster's audiometric software runs the age-correction tables automatically for every employer that has elected to use them, pulling the employee's date of birth and test date to apply the correct age bracket at both baseline and current test — removing the risk of a technician defaulting to raw thresholds for one employee and corrected values for another. The election is set once at the program level during setup, documented in the account record, and applied the same way across every hearing testing visit for that employer, so the consistency requirement in Appendix F is built into the workflow rather than left to a technician's memory in the field. Employers who haven't decided whether to use age correction can review both raw and corrected results side by side on Foster's reports before committing to a program-wide policy.

Frequently Asked Questions

Does age correction change the baseline audiogram?

No. Age correction only adjusts the comparison used to determine whether an STS occurred on a current-year test. The stored baseline audiogram is never altered.

Can an employer apply age correction to some employees and not others?

No. Appendix F requires the election to be applied consistently across the workforce, not selectively based on which employees would benefit.

Does age correction affect OSHA 300 Log recordability?

No. The recordability decision under 29 CFR 1904.10 is a separate determination from the STS calculation and does not use age-corrected values. See Foster's guide to STS and OSHA 300 Log recordkeeping.

Are the age-correction tables the same for men and women?

No. Appendix F publishes separate tables for men and women because average age-related hearing decline differs by sex in the reference population OSHA used to build the tables.

Can age correction turn a real STS into a non-event?

It can move a borderline case below the 10 dB threshold, but it doesn't erase the underlying audiogram data. A reviewing professional can still consider the raw shift when deciding whether further evaluation is warranted.

Foster runs both raw and age-corrected STS calculations on every annual test — see on-site testing for program details, or request a quote to set up a hearing conservation program.