Table 5

Methodological quality ratings of intervention studies included using the epidemiological appraisal instrument

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  • Black shading represents ‘Yes’ (score of 2); grey shading represents ‘Partial’ (score of 1); white (no shading) represents ‘No’ or ‘Unable to determine’ (score of 0); diagonally lined represents ‘Not applicable’ (items removed from scoring).

  • M, moderate quality.