Income and education were used as separate indicators of SEP, as both measure different aspects of SEP [26]. The online research agency supplied data on gross household income of participating panel members, categorised as low (<€13.300 per year), middle (€13.300 - €41.200), and high (>€41.200 per year). Participants reported their highest completed level of education in the survey. Following ISCED 2011 classifications, education was categorised as low (lower secondary education at most; ISCED 0-2), middle (upper secondary education; ISCED 3-4), or high (tertiary education; ISCED 5-6).
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