4.2. Analysis.

Comparison 4: Topical salicylic acid versus other topical treatments, Outcome 2: Participants' global self‐assessment of acne improvement

Participants' global self‐assessment of acne improvement
Study	Duration	Items	Salicylic acid	Topical treatments (comparator)	P value
split‐face trials
Bae 2013	short term	mild to good improvement	12 (92.3%)	11 (84.6%) (Jessner's Solution)	P value was not reported; Quote" "In terms of subject global assessment...there is no significant differences between the groups..."
Kessler 2008	treatment duration of 10 weeks, measured at two months post‐treatment	patient self‐assessment questionnaire	35%	41%(glycolic acid peel)	P value was not reported.
parallel trial
Chantalat 2006	medium term	acne parameters and broad skin benefits	Unclear, not reported	Unclear, not reported (10% benzoyl peroxide, BPO)	Unclear, not reported. Quote: "Subject self assessment results show that subjects treated with the microgel complex reported a greater improvement...compared to 10% BPO."