The aim of the national survey of midlife development in the United States (MIDUS), first conducted in 1995/1996, was to investigate the role of behavioral, psychological, and social factors in health and well-being.

The MIDUS was implemented in Lifelines in the context of an additional assessment: MHDQ. The included questions are about the relationship with your parents while growing up. This questionnaire was not validated and translated by Lifelines.