Categorical answer modes provide superior validity to open answers when asking for level of physical activity: A cross-sectional study

Sven J.G. Olsson, Örjan Ekblom, Eva Andersson, Mats Börjesson, Lena V. Kallings
  • Scandinavian Journal of Public Health, September 2015, SAGE Publishing
  • DOI: 10.1177/1403494815602830
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The following have contributed to this page: Dr Sven Johan Gustav Olsson