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Table 5 Comparison of outcomes in commercially vs. freshly prepared SA peels

From: Comparison of efficacy of commercially available vs. freshly prepared salicylic acid peel in treatment of acne: a randomized open-label study

  Commercially available SA peel Freshly prepared SA peel   
  Objective: mean improvement in total acne score Subjective: VAS Objective: mean improvement in total acne score Subjective: VAS P value for total acne score* P value for VAS**
At day 0
At 2 weeks 25.4 30 27.5 40 0.08 0.07
At 4 weeks 30.1 51 38.4 65 0.06 0.05
At 6 weeks 36.8 67.5 50 70.4 0.04 0.63
At 8 weeks 50.4 78.3 68 81.6 0.05 0.57
At 10 weeks 73.3 81 75.8 89.5 0.8 0.05
At 12 weeks 78.3 84.3 80.1 90.1 0.05 0.05
  P < 0.05 # P < 0.05 # P < 0.05 # P < 0.05 #   
  1. The italics P < 0.05 value was considered significant for the analysis
  2. *Unpaired t test for comparison of the commercially available and freshly prepared SA peel groups
  3. **Chi-square test for comparison of VAS between the commercially available and freshly prepared SA peel groups
  4. #Within-group comparison; paired t test