Table 3.

Perioperative and postoperative risk factors of surgical site infection

ASA, American Society of Anesthesiology; NNIS, National Nosocomial Infection Surveillance; OP, operation; HEPA, high-efficiency particulate air; NS, not significant; SD, standard deviation; SSI, surgical site infection.

Data are expressed as the mean ± SD or number (percent) or median (interquartile range).

^ahealthy, 1; mild systemic disorder, 2; severe systemic disorder, ≥ 3.

^bMann-Whitney U test.

^cStudent's t-test.