Table 2

Newcastle–Ottawa scale for cohort studies

Study IDSelectionComparabilityOutcomeTotal score
Representativeness of the exposed cohortSelection of the non-exposed cohortAscertainment of exposureDemonstration that outcome of interest was not present at start of studyComparability of cohorts on the basis of the design or analysisAssessment of outcomeWas follow-up long enough for outcomes to occur?Adequacy of follow-up of cohorts
Akmal_2017_Egypt*******7
Alexandrou_2010_Sweden*********9
Blanco_2006_USA*********9
Bochkova_2019_Russia+ *****5
Bozdag_2012_Turkey*********9
Cardona_2014_USA+ *********9
Chen_2001_Taiwan*******7
De Carolis _2015_Italy+ *******7
Goldner Perez_ 2019_USA+ *****5
Heimann_2007_Germany*******7
Jagla_2019_Poland*********9
Kao_2006_USA*********9
Lilien_1979_USA*******7
Manzoni_2016_Italy+ *********9
Mohsen_2014_Egypt*********9
Nicolaeva _2015_Russia*******7
Ramel_2013_USA*********9
Sabzehei_2014_Iran*********9
Scheurer_2016_USA*********9
Stensvold_2015_Norway********8
Szymońska_2015_Poland*********9
Tottman_2017_Newzealand********8
Turai_2019_Hungary*********9
Van der Lugt_2010_Netherlands*********9
Vannadil_2019_India*****5
Villamizar_2020_USA********9
Yoo_2013_Korea*********9
Zamir_2018_Sweden*********9
Zamir_2019_Sweden*********9
  • +Abstract only.