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Table 2 Level of evidence rating criteria

From: A systematic review and recommendations for prom instruments for older people with frailty in emergency care

Level Rating Criteria
Strong + or − Consistent findings in multiple studies of good methodological quality
OR in one study of excellent methodological quality
Moderate + or − Consistent findings in multiple studies of fair methodological quality
OR in one study of good methodological quality
Limited + or − One study of fair methodological quality
Conflicting + or − Conflicting findings
Unknown ? Only studies of poor methodological quality or no studies
  1.  + : positive rating, ?: indeterminate rating, −: negative rating