Chretien 1980.

Methods	RCT Study aim clearly defined: yes Blinded assessor of primary outcome: not stated Double blind study: yes Participants comparable at baseline for age: yes Sex: not stated Duration of complaint: yes Inclusion and exclusion criteria specified: yes Interventions well described: yes Assessment of compliance: not stated Reoccurrence status: yes Intention to treat analysis: not stated A Priori sample size calculation: not stated Fungi identified: yes Distribution of species between groups: yes Adverse events reported: not stated Number of drop outs stated: not stated
Participants	Total evaluable sample size: 85
Interventions	A. 2% undecylenic acid and 20% zinc acid powder Duration: four weeks Frequency: applied twice daily b. Placebo powder Duration: four weeks Frequency: applied twice daily
Outcomes	Primary outcome: cure Secondary outcomes:signs and symptoms ‐ erthythema, scaling, fissuring, hyperkeratosis
Notes	Culture results only
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	D ‐ Not used