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Estimated maximum recommended preoperative bone-conduction thresholds, which include a “gray” zone depending on if an aided PTA of at least 30 or 35 dB HL is met.
Abbreviations: BCI, bone-conduction implant; HL, hearing level; max, maximum; preop, preoperative; PTA, pure-tone average; PTA4, four-frequency averages of PTA; PTAbc, pure-tone average for bone-conduction.
