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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