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Table 2 Quality assessment of the included cross-sectional studies using the adopted Newcastle-Ottawa Scale (NOS)

From: Substance use disorders in Saudi Arabia: a scoping review

  Selection Comparability Outcome Total
Author Representativeness of the sample () Sample size () Non-respondents () Ascertainment of the exposure (risk factor) () () Assessment of outcome () Statistical test () (*10)
Alkhalaf et al., 2019 [46] * * * 3
Ibrahim et al., 2018 [7] * ** 3
Almarhabi et al., 2018 [41] * * * ** * 6
Alshomrani, 2015 [36] * * ** * 5
Khalil, 2011 [45] ** ** * 5
Alzahrani AJ et al., 2009 [37] ** 2
Bassiony, 2008 [28] ** * * 4
Alzahrani AJ, 2005 [39] * ** 3
AbuMadini et al., 2008 [29] * ** ** * 6
Abalkhail, 2001 [30] * ** * 4
Iqbal, 2000 [31] * ** ** 5
al-Nahedh, 1999 [32] * * * 3
Njoh and Zimmo, 1997 [40] * ** ** 5
Hafeiz, 1995 [33] * ** * 4
Osman, 1992 [17] * * ** 4
Qureshi, 1992 [34] ** * ** * 6
Iqbal, 2001 [35] ** * 3
Alzahrani H et al., 2015 [44] * * * ** * 6
Omer and Ezzat, 1999 [47] * * * 3