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This protocol paper was written by NSFJ, RS, JRJ and LVFO, with input of all co-authors. All authors read and approved the final manuscript. Funding: Coordena??o de Aperfei?oamento de Pessoal de N��vel Superior (201201678/CAPES-PROSUP/PHD). Competing interests: None declared. Patient consent: Obtained. CYTH4 Ethics approval: The Human Research Ethics Committees of Santa Casa de Misericordia Hospital (process number 178/2012) and Human Research Ethics Committee of Nove de Julho University (process number 370474/2010). Provenance and peer review: Not commissioned; externally peer reviewed. Data sharing statement: No additional data are available.""Hoffman et al4 5 tabulate median better-ear thresholds from the US National Health and Nutrition Examination Survey (NHANES) (1999�C2004, 1999�C2006) by sex, and by 10-year age bands (25�C34, 35�C44, 45�C54, 55�C64, and 65�C74?years). These data represent hearing thresholds of more than 5000 persons and are considered representative of the unscreened non-institutionalised population of the USA during those years. Using these data, regression analysis was used to predict new age-correction values for both men and women for ages 20�C75?years. Regression equations began with simple linear fits of PTA versus age and proceeded to second-order and higher order polynomial fits until adjusted multiple R2 failed to increase, using VassarStats online statistical software.6 OSHA's current tables (FI, F2) list age-correction values in separate columns for each test frequency, for example, 2, 3 and 4?kHz, at each age, for both sexes. The procedure assumes that age correction is performed separately for each of these three frequencies, and that the three age-corrected threshold shifts are then averaged to obtain a PTA234 value. A shift in PTA234 of 10?dB or greater constitutes an STS for the ear in question. However, it is easy to show algebraically that it is unnecessary to calculate threshold shifts for all three frequencies separately. Since the three threshold shifts at 2, 3 and 4?kHz are eventually averaged in the STS calculation, the identical result is obtained (much more simply) by using only a single column of age-correction factors for each sex, representing PTA234. Thus, the age-correction table we propose has only two columns: one for men and one for women. In addition, we show a hybrid table?in which the existing OSHA age-correction data are retained up to age 60?years, with the NHANES data used for extending the tables up to age 75?years. Results Figures?2 and ?and33 show the NHANES better-ear median thresholds for 2, 3 and 4?kHz, for each of the age bands mentioned above (nominally, 30, 40, 50, 60 and 70?years of age) for men and women, respectively. As in all such surveys, hearing thresholds not only increase with age, but also display acceleration. In other words, the rate of change increases with age.