Hearing threshold was assessed by a qualified audiologist after at least 14 h noise avoidance using Interacoustics Audiometer AD229e (Interacoustics A/S, Assens, Denmark) in an acoustic chamber, meeting the ANSI S3.1–1991 standards.
Hearing threshold was assessed by a qualified audiologistafter at least 14 h noise avoidance using InteracousticsAudiometer AD229e (Interacoustics A/S, Assens, Denmark)in an acoustic chamber, meeting the ANSI S3.1–1991standards.