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Table 3 Observed and estimated ventilator-associated pneumonia (VAP) in ICUs of University of Lyon hospitals (France), January 2001-December 2009

From: Early-onset ventilator-associated pneumonia incidence in intensive care units: a surveillance-based study

  Period of VAP estimation Period of VAP surveillance
Characteristics Day 0 Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 Day 8
Observed cumulative invasive mechanical ventilation days at risk 1,693.5 5,059.5 8,382.5 10,944.5 12,960.5 14,549.5 15,858.5 16,926.5 17,792.5
Observed number of VAP - - 50 82 77 54 50 31 23
Estimated number of VAP (95% CI) 9 (5-19) 33 (22-50) 57 (46-72) 71 (62-81) 73 (63-83) 64 (55-74) 49 (42-57) 33 (27-40) 20 (14-28)
Observed cumulative incidence of VAP (95% CI) - - 6.0 (4.5-7.8) 12.1 (10.1-14.3) 16.1 (14.1-18.4) 18.1 (16.0-20.4) 19.7 (17.6-22.0) 20.3 (18.3-22.6) 20.6 (18.6-22.8)
Estimated cumulative incidence of VAP (95% CI) 5.3 (2.6-9.8) 8.3 (6.1-11.1) 11.8 (9.7-14.3) 15.5 (13.3-18.0) 18.8 (16.5-21.2) 21.1 (18.8-23.6) 22.5 (20.2-24.9) 23.0 (20.1-25.4) 23.0 (20.8-25.3)
  1. CI: confidence interval