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Study design

 

The population of the lidA study consists of participants born in 1959 or 1965, who were in employment (subject to social security contributions) on 31st December 2009. The participants from these two cohorts are repeatedly interviewed at intervals of three or four years.

 

In the first wave in 2011 6,585, in the second wave 4,244 and in the third wave 3,586 employees were interviewed. The sample is representative for the German working same age population.