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Table 2 Summary of the quality and agreed level of bias and level of agreement on the methodological qualities of included studies in a meta-analysis based on sampling, outcome, response rate and method of analysis

From: Epidemiology of khat (Catha edulis) consumption among university students: a meta-analysis

Study Overall agreement and precision Nos quality (score on 0 to 9 scale)
Percentage of agreement Kappa value Level of agreement  
Dida et.al. (2014) [33] 75 0.60 Moderate 7
Tesfaye (2013) [34] 100 1 Almost perfect 8
Hagos et.al. (2013) [35] 75 0.60 Moderate 7
Mekonen et.al. (2017) [36] 100 1 Almost perfect 8
Tadesse et.al. (2014) [37] 100 1 Almost perfect 9
Eshetu et.al. (2006) [38] 100 1 Almost perfect 8
Shiferaw et al. (2017) [39] 75 0.60 Moderate 7
Kassa et.al. (2016) [40] 100 1 Almost perfect 9
Gebreslassie et.al (2013) [41] 100 1 Almost perfect 9
Deressa et.al. (2010) [42] 100 1 Almost perfect 9
Dessie et.al. (2013) [43] 75 0.60 Moderate 7
Adere et.al. (2017) [44] 100 1 Almost perfect 8
Reda AA et.al (2012) [25] 100 1 Almost perfect 8
Mulugeta Y. et.al (2015) [45] 100 1 Almost perfect 8
Kebede (2005) [46] 100 1 Almost perfect 9
Abdeta et al. (2017) [47] 100 1 Almost perfect 8
Astatkie et al. (2015) [48] 100 1 Almost perfect 8
Gebrehanna et al. (2014) [49] 100 1 Almost perfect 8
Alsanosy et al. (2013) [51] 100 1 Almost perfect 8
Quadri et al. (2015) [52] 100 1 Almost perfect 9
Ageely (2009) [27] 100 1 Almost perfect 8
Kubas Ma et.al. 2015 [53] 100 1 Almost perfect 9
Alkhader nl et.al (2009) [54] 75 0.50 Moderate 6
Dhaifullah et.al (2013) [55] 75 0.60 Moderate 7
Dachew BA.et al.(2014) [50] 100 1 Almost perfect 9