Table 2.

Summary of Critical Appraisal Skills Program (CASP) results.

Reference	Did the Study Address a Clearly Focused Issue?	Was the Cohort Recruited in An Acceptable Way?	Was the Exposure Accurately Measured to Minimize Bias?	Was the Outcome Accurately Measured to Minimize Bias?	Have the Authors Identified All Important Confounding Factors?	Have They Taken Account of the Confounding Factors in the Design and/or Analysis?	Was the Follow Up of Subjects Complete Enough?	Was the Follow Up of Subjects Long Enough?
Baron et al. [36]	Yes	Yes	Yes	Yes	No	Yes	No	No
Stene-Larsen et al. [37]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No
Brown et al. [38]	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes
Brumbaugh et al. [39]	Yes	Yes	Yes	Yes	No	No	Yes	Yes
Shah et al. [40]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Sejer et al. [41]	Yes	Yes	Yes	Yes	Yes	Yes	Can’t tell	Yes
Hodel et al. [42]	Yes	Yes	Yes	Yes	No	No	Yes	Yes
Hornman et al. [43]	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes
Quigley et al. [44]	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes
Baron et al. [45]	Yes	Yes	Yes	Yes	No	No	Yes	Yes
Rider et al. [46]	Yes	Yes	Yes	Yes	No	No	Yes	Yes
Bogicevic et al. [47]	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes
Woythaler et al. [48]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Chan &Quigley [49]	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes
Sheehan et al. [50]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Brumbaugh et al. [51]	Yes	Yes	Yes	Yes	No	No	No	Yes