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Reference period for core variables: constant, at selection, income reference period, usual week, last 4 weeks, last 12 months, since last year, working life, childcare reference period.The reference period for the 2011 Module is when the interviewee was around 14 years old. (Eurostat (2011): DESCRIPTION OF TARGET VARIABLES: Cross-sectional and Longitudinal. 2011 operation, p. 47, 385.)
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