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Table 2 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: Prevalence and risk factors for khat use among youth students in Ethiopia: systematic review and meta-analysis, 2018

Study

Percentage of agreement

Kappa value

Level of agreement

Nos quality (score on 0 to 9 scale)

Abdeta T (2017)

100

1

Almost perfect

8

Ayana A (2004)

100

1

Almost perfect

9

Reda A (2012)

100

1

Almost perfect

8

Dires E (2016)

100

1

Almost perfect

8

Astatkie A (2015)

100

1

Almost perfect

8

Kassa A (2016)

100

1

Almost perfect

9

Kassa A (2017)

100

1

Almost perfect

9

Kassa A (2014)

100

1

Almost perfect

9

Gebreslassie M (2013)

100

1

Almost perfect

9

Gebrehanna E (2014)

100

1

Almost perfect

8

Teni FS (2015)

75

0.60

Moderate

7

Zein ZA (1998)

75

0.60

Moderate

7

Bizuayehu G (2009)

100

1

Almost perfect

9

Aklilu S (2013)

100

1

Almost perfect

8

Berihun AD (2015)

100

1

Almost perfect

9

Lakew A (2014)

100

1

Almost perfect

8

Adere A (2017)

100

1

Almost perfect

8

Yegazew K (2002)

100

1

Almost perfect

9