Fig. 1

Keyword Co-Occurrence Network Graph for the Overall Research Field on Parental Mental Illness in the Period from 1999 to 2018. The graph is based on keywords in articles from the following research areas: ‘substance use disorders’; ‘psychotic disorders’; ‘mood and affective disorders’; ‘anxiety disorders’; ‘behavioral syndromes’; personality disorders’; and ‘generic psychiatric disorders’. Red cluster: Expectant mothers and early motherhood; Green cluster: Diagnoses, symptoms and treatment; Yellow cluster: Child–parent interaction and context; Turquoise cluster: SES and support practices; and Blue cluster: Biomedical research. Size of circle shows the relative number of occurrences of a keyword, and weight of line indicates the frequency two keywords are linked. Please note the number of lines in the figure has been reduced for legibility in the print edition. To view all the links, please access the interactive map using the Map and Network files found at OSF: https://osf.io/9ruva and the VOSviewer software