Table 4.

Reporting and methodological quality

Quality Assessed	Study Design	Cohort & Cross sectional Studies						Case-Control
	Author, Year	Laaksi, 2007	He, 2013	Rafiq, 2018	Sabetta, 2010	Berry, 2011	Lee, 2018	Jovanovich, 2014	Nanri, 2017
	Section/ Domain
Reporting Qualitya	Title, Abstract and Introduction	High	Fair	High	Fair	High	High	High	High
	Methods	High	High	High	High	High	High	High	High
	Results	Low	High	Low	High	High	High	High	High
	Discussion	Fair	Low	High	High	High	High	High	High
	Other information	High	High	High	High	High	High	High	High
	Overall	Low	Fair	Fair	High	High	High	High	High
Methodology Qualityb	Selection	High	High	High	High	High	High	High	High
	Misclassification	High	High	Low	High	High	Low	High	High
	Detection	Fair	Low	Low	High	Low	Low	High	High
	Confounding	Low	Low	High	Low	High	High	High	High
	Other (Inappropriate sample size, attrition)	Low	Low	High	Low	Low	Low	Low	Low

Y Yes, N No, CT Can’t tell, N/A Not Applicable, P Partially reported

^aAssessed with the STROBE statement

^bAssessed by the NHLBI Quality Assessment Tool for Observational Cohort, Cross-Sectional and Case-control studies; a high quality indicates a low risk of bias in the assessed domain, and vice versa