Cornell 1993.

Methods	Study type: RCT of body parts Randomisation method: computerised randomisation Blinding: double‐blind Intention‐to‐treat analysis used: yes
Participants	Inclusion criteria of the trial Seborrhoeic dermatitis of the scalp Exclusion criteria of the trial Pregnant and nursing women People with known hypersensitivities to any of the products or their ingredients People with evidence of atrophy Number of randomised participants: 30 in total Number of dropouts: 1 (3%) Sex: 14 males, 16 females Age (mean): 37.7 years Country: USA
Interventions	Treatment Desonide 0.05% cream, applied to the scalp twice daily for 8 weeks Comparator/s Hydrocortisone 1.0% cream, applied to the scalp twice daily for 8 weeks
Outcomes	Total number of telangiectasia
Notes	1 of 2 included studies comparing mild steroids with each other. The adverse events rate was calculated from a table
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computerised randomisation was used
Allocation concealment (selection bias)	Unclear risk	No information was provided
Similarity of the study groups (selection bias)	Unclear risk	Bilateral disease severity was not reported separately
Blinding of participants (performance bias)	Low risk	Colour‐coded side‐labelled tubes were used
Blinding of care providers (performance bias)	Unclear risk	Whilst the study was reported to be double‐blind, it was not clear who was blinded
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Whilst the study was reported to be double‐blind, it was not clear who was blinded
Incomplete outcome data (attrition bias) All outcomes	Low risk	The number of dropouts was small
Selective reporting (reporting bias)	Low risk	No selective reporting bias was identified
Other bias	Unclear risk	The pharmaceutical industry supported the study, and the corresponding author was affiliated with the pharmaceutical industry