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. 2015 Mar 27;5(3):e005793. doi: 10.1136/bmjopen-2014-005793

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

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Calculated occupational noise index for obstetrics personnel. (A) The contribution of the variable number of years worked in obstetrics (in black) to the noise index for each participant, each bar representing one participant. The light grey bars represent the index with the variable years worked in obstetrics omitted. The percentages of participants are shown on the x axis and the calculated noise index value on the y axis. (B) The correlation between occupational noise index and age of participants.