Table 2.

Average quality scores on quality scores for studies included in the meta-analysis.

Categories of quality scoring (maximum points value)	Average (%) of the maximum category quality score (range)		ICCa for interobserver agreement (95% CI)
	Cross-sectional (n = 7)	Cohort studies (n = 1)
Selection (20 points)	15.8 (14.7–16.0)	18.7	0.659 (−0.015–0.922)
Exposure (30 points)	24.3 (18.3–30.0)	20.0	0.870 (0.563–0.972)
Outcome (20 points)	14.7 (1.3–17.3)	16.0	0.958 (0.644–0.992)
Confounders (20 points)	18.6 (13.3–20.0)	10.0	0.578 (−0.188–0.902)
Analysis (10 points)	10 (10.0-10.0)	9.3	0.001 (−0.238–0.782)
Total quality score (100 points)	84.1 (61.0–93.3)	74.0	0.884 (0.620–0.975)

^aICC: intraclass correlation coefficient.