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Table 4 Levels of evidence for the overall adequacy of a measurement property adapted from [28]

From: Measurement properties of quality of life measurement instruments for infants, children and adolescents with eczema: protocol for a systematic review

Level Rating Criteria
Strong +++, ? (strong) or −−− Consistent findings in multiple studies of good methodological quality OR in one study of excellent methodological quality
Moderate ++, ? (moderate) or −− Consistent findings in multiple studies of fair methodological quality OR in one study of good methodological quality
Limited +, ? (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