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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