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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