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Table 3 Multiple logistic regression analysis stratified by the NNIS risk index

From: Association between the frequency of surgeries for video-assisted thoracic surgery and the incidence of consequent surgical site infections: a retrospective observational study based on national surveillance data

  OR 95% CI p value
NNIS risk index 1 group
 Male sex 2.13 1.31–3.48 0.0024
 Age 1.02 1.01–1.03 0.0021
  < 50/year 2.48 1.20–5.13 0.0143
  50–100/year Reference Reference Reference
  > 100/year 2.43 1.44–4.11 0.0009
NNIS risk indices 2–3 group
 Male sex    0.063
 Age    0.65
  < 50/year 4.83 1.47–15.93 0.0095
  50–100/year Reference Reference Reference
  > 100/year    0.21
  1. NNIS National Nosocomial Infections Surveillance System