“…The risk of bias due to confounding was considered serious in nine of the studies (Boarnet et al, 2005a(Boarnet et al, , 2005bBuliung et al, 2009;Deehr and Shumann, 2009;Fitzhugh et al, 2010;Garrard and Crawford, 2010;Morrison et al, 2004;Moudon and Stewart, 2012;Parker et al, 2013). The risk of bias due to selection of participants (Boarnet et al, 2005a(Boarnet et al, , 2005bBuliung et al, 2009;Deehr and Shumann, 2009;Fitzhugh et al, 2010;Garrard and Crawford, 2010;Hinckson and Badland, 2011;Mammen et al, 2014aMammen et al, , 2014bMcDonald et al, 2013;Morrison et al, 2004;Moudon and Stewart, 2012;Parker et al, 2013) and measurement outcomes (Boarnet et al, 2005a(Boarnet et al, , 2005bBuliung et al, 2009;Deehr and Shumann, 2009;Fitzhugh et al, 2010;Garrard and Crawford, 2010;Hinckson and Badland, 2011;Mammen et al, 2014aMammen et al, , 2014bMcDonald et al, 2013;Morrison et al, 2004;Parker et al, 2013) was frequently considered serious.…”