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Table 2 Levels of evidence for the overall quality of the measurement property [16]

From: Measurement properties of translated versions of neck-specific questionnaires: 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. [..] = reference number
  2. + = positive result, - = negative result