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s management. To compare SSI rates between the skin preparation agents PI-Aq, povidone-iodine with alcohol (PI-Alc), and chlorhexidine with alcohol (C-Alc). Guidelines suggest that alcohol-containing chlorhexidine solutions are the gold standard for skin preparation before surgery. It remains difficult to determine whether it is the chlorhexidine component or the addition of alcohol that confers the most benefit. We conducted a multicenter, prospective, combined non-inferiority (PI-Alc vs C-Alc) and superiority (PI-Alc vs PI-Aq) randomize