Table 2.

Criteria for inclusion and exclusion

	Criteria for inclusion	Criteria for exclusion
Study center	• Suitable premises and technical equipment • Located in Germany • Designation of a certified diabetes educator (CDE) with adequate expertise in diabetes management • CDE’s participation in the Train-the-Trainer program	• Healthcare facilities specializing in the treatment of diabetes in hospitals
Participating relatives	• Relatives of patients with diagnosed diabetes mellitus type 1 or type 2 • Spouses, partners, or family members who live together with the diabetes patient • Aged at least 18 years	• Dementia or other severe cognitive or physical diseases, which impede regular attendance • Insufficient level of German • Shift work • More than one close relative suffering from diabetes • Relatives who are themselves diagnosed with diabetes mellitus
Participating patients	• Aged at least 18 years	• Inability to fill out the questionnaires • Insufficient level of German