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Table 3 Single variable analysis of risk factors for SARS Co-V infection among hospital staff cases and controls, Hanoi, 2003.

From: Factors associated with nosocomial SARS-CoV transmission among healthcare workers in Hanoi, Vietnam, 2003

     SARS cases Controls
Activities During Index Patient's Hospitalization OR* 95% CI p-value n = 22 % n = 45 %
Touched index patient 2.8 0.9–8.5 0.085 9 (41) 9 (20)
Talked to or touched index patient without mask (ever) 1.9 0.6–5.9 0.363 7 (32) 9 (20)
Came within 1 meter of index patient 9.3 2.8–30.9 <0.001 17 (77) 12 (27)
Came within 1 meter of index patient, without mask (ever) 5.4 1.8–16.3 0.003 14 (64) 11 (24)
Spoke with index patient 3.5 1.2–10.4 0.028 11 (50) 10 (22)
Entered patient room 20.0 4.1–97.1 <0.001 20 (91) 15 (33)
Spoke with index patient in his room 3.7 1.1–12.6 0.052 8 (36) 6 (13)
Saw (viewed) index patient 14.0 3.6–55.3 <0.001 19 (86) 14 (31)
Visited patient room when patient was not there 3.7 1.3–10.9 0.027 12 (55) 11 (24)
Touched visibly contaminated surface 7.8 2.3–25.9 0.001 12 (55) 6 (13)
Entered general ward 8.0 1.7–38.4 0.005 20 (91) 25 (56)
Other characteristics §        
Upper respiratory infection w/in prior 6 months 0.2 0.04–0.9 0.039 2 (9) 15 (33)
'Other' non-clinical job 0.2 0.03–0.7 0.011 2 (9) 18 (40)
Direct patient care activities 2.0 0.7–5.6 0.298 13 (59) 19 (42)
Sanitation/kitchen job 2.2 0.7–7.0 0.223 7 (32) 8 (18)
  1. * Mantel-Haenszel odds ratio; odds ratios refer to affirmative responses.
  2. Fischer's exact (two-sided).
  3. ‡ Respirator or surgical mask; N95 respirator masks were not widely available at Hospital A until March 12th.
  4. § A proportion of enrollees (n = 19 cases, n = 8 controls) were asked about a history of heart disease, lung disease, diabetes, and smoking. None of these factors had a statistically significant association with SARS cases status.
  5. ¶ Other non-clinical jobs include administration, reception, security, maintenance, operations (see Table 1).