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Table 2 Levels of evidence for prognostic factors on shoulder disorders

From: Pain intensity, neck pain and longer duration of complaints predict poorer outcome in patients with shoulder pain – a systematic review

Level of evidence  
Strong Consistent findings (>75 %) in at least two high quality cohorts
Moderate Consistent findings (>75 %) in one high quality cohort and at least one low quality cohort
Weak Findings of one high quality cohort or consistent findings (>75 %) in at least three or more low quality cohorts
Inconclusive Inconsistent findings irrespective of study quality, or less than three low quality cohorts available
No evidence No data presented