Table 2.

Joanna Briggs Institute (JBI) scores for longitudinal studies

Study	JBI score	Participants and setting described in detail, including similarity of controls	Criteria for inclusion in sample clearly defined and exposures similarly measured	Exposure measured in valid and reliable way	Objective, standard criteria used for measurement of condition	Confounding factors identified	Strategies to deal with confounding factors stated	Outcomes measured in valid and reliable way	Appropriate statistical analysis used?	Sufficient follow-up time	Reasons for loss of follow-up	Strategies to deal with incomplete follow-up
Chen 2006	8	+	+	+	+	+	+	+	+	+	-	-
Chen 2007	7	+	+	+	+	-	-	+	+	+	-	-
Chong 2004	9	+	+	+	+	+	+	+	+	+	-	-
Lee 2018	7	+	+	+	+	+	-	+	+	+	-	-
Lung 2009	8	+	+	+	+	+	+	+	+	+	-	-
McAlonan 2007	9	+	+	+	+	+	+	+	+	+	-	-
Su 2007	9	+	+	+	+	+	+	+	+	+	-	-
Lancee 2008	7	+	+	+	+	-	-	+	+	+	-	-