Table 1. Quality Assessment Tool Used to Assess Located Studies Including Scoring Criteria.

Criterion	Scoring
Representativeness	1: Random/consecutive and response rate>70%
	0.5: Restrictive inclusion/exclusion criteria or response rate<70%
	0: Convenience sampling
Adequate power	1: Describes power calculations and was adequately powered
	0.5: Does not describe calculations but is adequately powered (n>175)
	0: Is not adequately powered
Appropriate outcome measure	1: Both self-report and hospital records
	0.5: Hospital records or self-report with ≤20% attrition
	0: Self-report with >20% attrition
Controlling for confounder variables	1: Confounders controlled for by design or statistical analysis
	0: Confounders not controlled for
Appropriate statistical analyses	1: Appropriate statistical analyses used
	0.5: Appropriate statistical analyses used in univariate or multivariate analyses only
	0: Appropriate statistical analyses not used