Table 1:

Summary of the research methodology

Method	Description
Research Question Formulation	Formulation of research question.
The Systematic Search Strategy	Develop search strings based on identified relevant keywords, and search databases using the search strings.
Identification of the information	Databases	Search Strings
	PubMed	(“Environmental factors” OR “environment*”) AND (“mental health” OR “depression” OR “anxiety”) AND (“determinants” OR “risk factors” OR “predictors”) AND (“diabetes*” OR “diabetes mellitus”)
	Scopus	(“Environmental factors” OR “environment*”) AND (“mental health” OR “depression” OR “anxiety”) AND (“determinants” OR “risk factors” OR “predictors”) AND (“diabetes*” OR “diabetes mellitus”)
	Web of Science	(“Environmental factors” OR “environment*”) AND (“mental health” OR “depression” OR “anxiety”) AND (“determinants” OR “risk factors” OR “predictors”) AND (“diabetes*” OR “diabetes mellitus”)
Screening by using inclusion and exclusion criteria.	Establish the inclusion and exclusion criteria for literature selection in this review, and filter studies using the criteria.
Data extraction dan synthesis	Extraction of relevant data from the individual studies, continued with evaluation of the pooled data.

The symbol * was used as truncation and wildcard function to increase the variability of selected keywords