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Table 3 Measuring incidence of PMV using different numerators and denominators

From: Prolonged mechanical ventilation in critically ill patients: epidemiology, outcomes and modelling the potential cost consequences of establishing a regional weaning unit

Time period

Numerator and denominator

n

Incidence

(per 100 admissions)

95% CI

2002-2006

countPMV

349

4.4

4.0 to 4.9

 

ICUtotal

7,848

  

2002-2006

countPMV

349

6.3

5.7 to 7.0

 

ICUvent

5,552

  

2005-2006

consecPMV

126

3.7

3.1 to 4.4

 

ICUtotal

3,442

  

2005-2006

countPMV

135

3.9

3.3 to 4.6

 

ICUtotal

3,442

  
  1. CI, confidence interval; ICUtotal, all ICU admissions; ICUvent, ICU admissions requiring mechanical ventilation; PMV, prolonged mechanical ventilation. For definitions of countPMV and consecPMV see text.
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