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Table 2 p values (Wilcoxon test) for the reduction of aerobic and anaerobic flora by chlorhexidine-alcohol (CHG-ALC) and povidone-iodine-alcohol (PVP-I-ALC) after 2.5 and 30 min contact time; immediate and 3-h values

From: Comparison of the antimicrobial efficacy of povidone-iodine-alcohol versus chlorhexidine-alcohol for surgical skin preparation on the aerobic and anaerobic skin flora of the shoulder region

Preparation CHG-ALC 2.5 min contact CHG-ALC 30 min contact
Immediate After 3 h Immediate After 3 h
Aerobic values
PVP-I-ALC
2.5 min contact
0.04 0.08 0.13 0.14
PVP-I-ALC
30 min contact
0.78 0.53 0.54a 0.95
Anaerobic values
PVP-I-ALC
2.5 min contact
< 0.01 0.31 < 0.01 0.28
PVP-I-ALC
30 min contact
< 0.01 < 0.01 < 0.01 0.06b
  1. aThis comparison was numerically in favor of CHG-ALC; all other comparisons were numerically in favor of PVP-I-ALC
  2. bWhen samples without detectable CFU were excluded from the analysis of 3-h post-values, the p value was 0.03