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Table 1 Classification of evidence for studies of clinical outcomes of telemedicine interventions.

From: Clinical outcomes resulting from telemedicine interventions: a systematic review

Study Class Characteristic
I • Properly designed random controlled trials
II • Random controlled trials that contain design flaws preventing
  • specification of Class I
  • Properly designed trials with control groups not randomized
  • Multi-center or population-based longitudinal (cohort) study
  • Case control studies
III • Descriptive studies (uncontrolled case series)
  • Clinical experience
  • Expert opinion
  • Case reports