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. 2014 Oct 16;4(10):e005529. doi: 10.1136/bmjopen-2014-005529

Table 1.

Background data and noise exposure in male train and track maintenance workers compared with an internal male non-noise exposed reference group

Age Train maintenance Track maintenance Internal reference p Value
Age, mean (SD) 47.6 (11.9) 46.2 (13.0) 45.7 (11.8) <0.001*
Age, N
 −24 118 286 129
 25–34 225 275 504
 35–44 330 529 692
 45–54 555 801 738
 55–64 669 839 809
 Total 1897 2730 2872
Occupational noise exposure (dB(A)) 75–90+peak 75–90+peak <70

*Analysis of variance.