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Table 2 Comparison of NHIL duration, years of working, noise level, cortisol level, auditory thresholds, THI scores and PSQI scores between two groups, mean ± SD or M (P25, P75) or n (%)

Table 2 Comparison of NHIL duration, years of working, noise level, cortisol level, auditory thresholds, THI scores and PSQI scores between two groups, mean ± SD or M (P25, P75) or <i>n</i> (%)