List of abbreviations 183 Meandiff mean difference between two assessments mDDm Motorrijtuig DubbelDeks Materieel (Dutch train type) Ms millisecond NFR need for recovery NVAB Nederlandse vereniging voor arbeids- en bedrijfsgeneeskunde OAE otoacoustic emissions OEC occupational ear check PA personal adjustments QEEW questionnaire on the experience and evaluation of work SD standard deviation SDC smallest detectable change SDdiff standard deviation of the mean difference SEM standard error of measurement SNR signal-to-noise ratio SNR50 signal-to-noise ratio at which 50 percent of the warning signals can be detected SRT speech reception threshold SPSS statistical package for social sciences SSQ speech spatial and qualities of hearing scale UMC university medical center V-IRM Verlengd InterRegio Materieel (Dutch train type) WA work adjustments
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