Table 2. Checklist for data extraction from the selected articles.

IMI: Intramuscular injection

Sr. no	Data Collected	Data Ignored
1	Whether any new site for deltoid IMI is proposed	Information about any technique of administering deltoid IMI
2	Whether any reason is mentioned for recommending the proposed deltoid IM site	Information about importance of needle depth and angle of needle insertion at the time of administering IM
3	Whether any site is not recommended or marked as high risk for deltoid IMI	Information about importance of measuring the thickness of subcutaneous tissue at the IM site
4	Whether any reasons are mentioned for not recommending any deltoid IM site	Information about importance of choosing the type of needle while administering IMI
5	Whether any neurovascular structures are underlying the not-proposed IM site
6	Mention of any post-injection complications occurring after deltoid IMI
7	Critical appraisal of currently used techniques for deltoid IMI
8	Reference to common mistakes committed by healthcare workers in administering deltoid IMI
9	Variations in the pattern of neurovascular structures in proximity to the deltoid muscle