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Table 1 Level of evidence for a causal relationship.

From: Computer work and musculoskeletal disorders of the neck and upper extremity: A systematic review

Diagnosis

Risk factor

 

Computer use per se

Computer mouse time

Computer keyboard time

Tension neck syndrome

+

+

0

Shoulder tendonitis

0

0

0

Epicondylitis (medial or lateral)

0

0

0

Forearm disorders

0

+

0

Wrist tendonitis

+

+

+

  1. +++ Strong evidence
  2. ++ Moderate evidence
  3. + Limited evidence
  4. 0 Insufficient evidence
  5. - Evidence suggesting a lack of causal relation