“…Some studies, however, report no interaction with age. This was the case for a study based on analysis of the European Community Household Panel (Huisman, Kunst, & Mackenbach, 2003 ), two studies from each of Finland (Nummela, Sulander, Heinonen, & Uutela, 2007 ; Sulander et al, 2012 adequacy of income only), Germany (Schmidt et al, 2012 for the mental component of quality of life only; von dem Knesebeck, Luschen, Cockerham, & Siegrist, 2003 ), Poland (Knurowski et al, 2004 ; Wroblewska, 2002 ), Italy (Laudisio et al, 2013 ; Pirani & Salvini, 2012 ) and three from England (Chandola et al, 2007 ; McFadden et al, 2008 ; Melzer et al, 2000 ). Some studies had a smaller sample size for older age groups, whereas others used stratified sampling to achieve numbers of about the same size in different age groups; however this difference did not seem to be systematically associated with whether or not associations between SEP and outcomes varied between age groups.…”