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ABR after noise exposure, the values are presented as the means ± SEM. (A)–(E) The alterations of ABR threshold of guinea pigs in each group after 105dB SPL military helicopter noise exposure. (F) The alterations of 80 dB SPL ABR wave I amplitude of guinea pigs in each group after 105dB SPL military helicopter noise exposure (µV). Note: n = 12 ears from 6 animals in each group. *p < 0.05, **p < 0.01.
