Table 3: Effects of a 1% increase in input variables on incremental cost effectiveness ratio.

Variable% VariationDirection
(cost effectiveness of QI intervention)

LOS (VAP)1.82Increase
CFR for VAP1.33Increase
Cost of hospital bed1.13Increase
Length of stay (non-VAP)0.60Decrease
CFR (non-VAP)0.22Decrease
Incidence of VAP postcollaborative0.22Decrease
Cost of antibiotics0.10Increase
Number of cultures (VAP)0.08Increase
Cost of cultures0.08Increase
Number of cultures (non-VAP)0.07Decrease
Cost of QI intervention0.07Decrease