“…23 Single-domain SES factors included household income (11 studies), [6][7][8]11,[14][15][16]22,26,29,30 mother's education (15 studies), 6,[9][10][11][12]16,17,21,22,24,25,29,31,34,36 father's education (11 studies), 6,10,11,16,17,22,24,25,29,34,36 highest level of parent's educational attainment (two studies) 26,33 and the level of health insurance (one study). 33 A total of 11 studies utilised composite measures, including the two-and four-factor Hollingshead indices (a combined measure of education and occupation; five studies), 19,20,28,32,35 the criteria for socio-economic stratification in Brazil (two studies), 6,8 the revised Kupp...…”