Table 1.

Inclusion and exclusion criteria.

Inclusion criteria	Exclusion criteria
Peer-reviewed primary article in English	Secondary data analysis, retracted article or a non-peer reviewed article
Subjects are located in India	Study includes some subjects from India but India-specific data is inaccessible
Subjects have an established non-communicable chronic disease	Study focuses on osteoarthritis or communicable diseases e.g., HIV or tuberculosis
Study design is a randomized control trial	Study design is not a randomized control trial
Subjects are exposed to an intervention with the primary or secondary intended effect of increasing medication adherence	Study was not a primary article reporting results of a trial relating to medication adherence*
Subjects are located within the community when taking medication (subjects may be recruited from a hospital)	Study population are hospital inpatients

^*Several included articles reported the results from the same primary study. Only the primary article(s) reporting results relating to medication adherence were included.