Tranexamic Acid for Adults with Melasma: A Systematic Review and Meta-Analysis

Table 4

Assessment of the quality of case-control studies.

Study; (first author, year)	Selection				Comparability^†	Exposure			Score
	Definition adequate?	Representativeness of cases	Selection of controls	Definition of controls		Ascertainment of exposure	Same method of ascertainment	Nonresponse rate
Cho 2013	☆	☆	☆	☆	☆☆	☆	☆	-	8
Tan 2016	☆	☆	-	-	☆☆	☆	-	☆	6

The assessment was based on the Newcastle-Ottawa Scale. The full mark of total score is defined as 9; a score of >7 indicates a low risk of bias.
† Comparability of cases and controls on the bias of design or analysis.