Additional file 1.

Table S1. Comparisons of anthropometrics (means) and percentages reporting symptoms and diseases between participants having answered questionnaire 1 (Q1) (23 049) or questionnaire 2 (Q2), and those having answered a shortened nonparticipation questionnaire (QNP) (nā€‰=ā€‰3677) among men stratified by age groups.

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Langhammer et al. BMC Medical Research Methodology 2012 12:143   doi:10.1186/1471-2288-12-143