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Table 2 Levels of evidence for the overall quality of the measurement property [24,25]

From: Measures of upper limb function for people with neck pain: a systematic review of measurement and practical properties (protocol)

Level Ratinga Criteria
Strong +++ or --- Consistent findings in multiple studies of good methodological quality OR in one study of excellent methodological quality
Moderate   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. a + = positive result, - = negative result.