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. 2013 Apr 18;3(4):e002394. doi: 10.1136/bmjopen-2012-002394

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Mean per cent correct over 15 simulated whispered voice test trials as a function of three-frequency pure-tone average (PTA) hearing loss for 112 individual ears tested with the recordings of 2 older experienced and 2 younger inexperienced whisperers. Data points above the 50% threshold indicate a pass.