Sample

The sample of the LifE study constitutes as a good reflection of the Youth Study, especially for relevant personal characteristics of developmental psychology research. It also deviates only marginally from the West German average of social status and family developments in adult ages. However, as expected, the study was not completely spared from the usual selection in long-term panel studies. The slight distortion in the sample is due to refusal (nonresponse) as well as the difficulty of finding the test persons after a long period of time (noncoverage). Therefore, with regard to the planned re-entry of the survey in 2012, several searches were carried out for addresses of unrepresented groups of persons until 2006.