Table A3.

Domains of risk of bias assessment.

Domains	Description	Judgement
methods for sample selection	Appropriateness of the sampling method	Is the sample selection method free of selection bias?
methods for data collection	Appropriateness of the method used to collect data	Is the method used to collect data appropriate to avoid putting the study at a high risk of bias?
methods for data analysis	Appropriateness of the method used to analyze data	Is the method used to analyze data appropriate to avoid putting the study at a high risk of bias?
selective reporting	Possibility of selective outcome reporting	Are reports of the study free of suggestion of selective outcome reporting?
conflict of interest	declarations of conflict of interest or identification of funding sources	Is the study apparently free of conflict of interest that could put it at a high risk of bias?
other sources of bias	Any important concerns about bias not addressed in the other domains in the tool	Is the study apparently free of other problems that could put it at a high risk of bias?