“…We designed the questionnaire in order to assess the frequency of various walks from home, and a broad set of demographic and social-economic indicators (hereafter called SEP indicators), see Table I. We based the choice of independent variables, SEP indicators, on a review of the international literature on walking constraints (Vistad et al, 2014). The aim was to include several potential SEP indicators in the analysis, to get a deeper understanding of the importance of the individual or household related factors determining walking behaviour or participation in physical exercise.…”