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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