Additional file 2.
Table S2. Comparisons of anthropometrics (means) and percentages reporting symptoms and diseases between participants having answered questionnaire 1 (Q1) (27 758) or questionnaire 2 (Q2), and those having answered a shortened nonparticipation questionnaire (QNP) (n = 3241) among women 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