Table 2. Barriers and facilitating factor categories for implementing a preventive intervention for people with or at risk of T2DM/GDM.

	barriers	facilitating factors	both within a study
Language	22	0	0
economic factors	40	0	0
family and friends	44	46	22
Work	28	0	0
social support	16	27	8
Religion	5	8	1
Culture	30	0	0
knowledge	44	15	4
other barriers (e.g. insufficient time, problems with travelling, insufficient motivation)	9	n.a.	n.a.

GDM: gestational diabetes; n.a.: not applicable; T2DM: type 2 diabetes mellitus

The total number of barriers and facilitating factors within each category is based on the number of identified studies which mentioned this barrier or facilitating factor.