Table 2. Quality assessment using the Joanna Briggs Institute (JBI) check tool for observational studies.

N/A: non-applicable.

Study/Year of publication	Were the two groups similar and recruited from the same population?	Were the exposures measured similarly to assign people to both exposed and unexposed groups?	Was the exposure measured in a valid and reliable way?	Were confounding factors identified?	Were the strategies to deal with confounding factors stated?	Were the groups/participants free of the outcome at the start of the study (or at the time of exposure)?	Were the outcomes measured in a valid and reliable way?	Was the follow-up time reported sufficient to be long enough for outcomes to occur?	Was the follow-up complete, and if not, were the reasons to loss to follow-up described and explored?	Were strategies to address incomplete follow-up utilized?	Was appropriate statistical analysis used?
Lindsay et al.  2009 [15]	N/A	Yes	Yes	Yes	Yes	Yes	Yes	Yes	N/A	Yes	Yes
Bafna et al.  2021 [16]	N/A	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Kim et al.  2015 [17]	Yes	Yes	Yes	N/A	Yes	Yes	Yes	Yes	Yes	N/A	Yes
Park et al.  2010 [18]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	N/A	Yes
Barbero-Villares et al. 2011 [19]	N/A	Yes	Yes	Yes	Yes	Yes	Yes	N/A	N/A	Yes	Yes
Lahdenne et al. 2002 [20]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes
Laharie et al. 2006 [21]	N/A	N/A	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Laharie et al.  2010 [22]	Yes	Yes	N/A	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes