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Table 4 Levels of evidence for the overall quality of a measurement property [16]

From: Measurement properties of adult quality-of-life measurement instruments for eczema: protocol for a systematic review

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 +/− Conflicting findings
Unknown ? Only studies of poor methodological quality
  1. +positive rating, ? indeterminate rating, −negative rating.