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. Author manuscript; available in PMC: 2011 Nov 16.
Published in final edited form as: Arch Phys Med Rehabil. 2010 May;91(5):816–831. doi: 10.1016/j.apmr.2010.01.022

Table 1.

Levels of evidence

Level 1 RCTS with a PEDro score ≥ 6
Level 2 RCTS with a PEDro score < 6, Cohort and Non-RCTS
Level 3 Case-Control studies
Level 4 Pre-Post or Post interventions and Case series,
Level 5 Case reports, Clinical Consensus or Observational studies

Straus et al. 200531