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Table 3 Quality assessment of the included case-control studies using the Newcastle-Ottawa Scale (NOS)

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

  Selection Comparability/ confounders Exposure Total
Author Adequacy of case definition () Representativeness of the cases () Selection of controls () Definition of controls () Comparability of cases and controls () Ascertainment of the exposure () Similarity of ascertainment between cases and controls () Non-response rate () (*9)
Khalawi et al., 2017 [9] * * 2
Youssef et al., 2016 [42] * * * * * 5
Alzahrani AJ, 2008 [38] * * * 3
Chinnian et al., 1994 [43] * * * * 4