Table 2.

PRISMA 2020 for Abstracts checklist*

Section and topic	Item #	Checklist item
Title
Title	1	Identify the report as a systematic review.
Background
Objectives	2	Provide an explicit statement of the main objective(s) or question(s) the review addresses.
Methods
Eligibility criteria	3	Specify the inclusion and exclusion criteria for the review.
Information sources	4	Specify the information sources (e.g. databases, registers) used to identify studies and the date when each was last searched.
Risk of bias	5	Specify the methods used to assess risk of bias in the included studies.
Synthesis of results	6	Specify the methods used to present and synthesise results.
Results
Included studies	7	Give the total number of included studies and participants and summarise relevant characteristics of studies.
Synthesis of results	8	Present results for main outcomes, preferably indicating the number of included studies and participants for each. If meta-analysis was done, report the summary estimate and confidence/credible interval. If comparing groups, indicate the direction of the effect (i.e. which group is favoured).
Discussion
Limitations of evidence	9	Provide a brief summary of the limitations of the evidence included in the review (e.g. study risk of bias, inconsistency and imprecision).
Interpretation	10	Provide a general interpretation of the results and important implications.
Other
Funding	11	Specify the primary source of funding for the review.
Registration	12	Provide the register name and registration number.

^*This abstract checklist retains the same items as those included in the PRISMA for Abstracts statement published in 2013,⁵⁴ but has been revised to make the wording consistent with the PRISMA 2020 statement and includes a new item recommending authors specify the methods used to present and synthesise results (item #6).