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Table 2 NHMRC Hierarchy of evidence

From: Safety and efficacy of tinea pedis and onychomycosis treatment in people with diabetes: a systematic review

Level of evidence Study design
I* A systematic review of level II studies
II A randomised controlled trial
III-1 A pseudorandomised controlled trial
III-2 A comparative study with concurrent controls
III-3 A comparative study without concurrent controls
IV Case series with either post-test or pre-test/post-test outcomes