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Table 2 Independent risk factors for the occurrence of large outbreaks (≥ 7 patients) as determined by multiple logistic regression analysis with stepwise variable selection

From: Health care workers causing large nosocomial outbreaks: a systematic review

Risk factor # all NO Odds ratio 95% confidence interval p-value
departments     
surgery 76 0.42 0.19–0.92 0.030
gynecology 20 6.89 1.55–30.63 0.011
pediatrics 9 0.05 0.00–0.45 0.008
occurrence after 1989     
reference value: no 71 1.00 n. d. 0.024
yes 72 0.48 0.22–1.06 0.068
aware of carrier status     
reference value: no 116 1.00 n. d. 0.024
yes 14 0.11 0.02–0.55 0.008
transmission     
unknown 13 0.16 0.03–0.75 0.020
  1. NO = nosocomial outbreak; n. d. = not defined.