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Table 4 Time-series analysis of the accumulated monthly effect of each intervention individually and of the whole bundle of measures

From: Impact of four sequential measures on the prevention of ventilator-associated pneumonia in cardiac surgery patients

  

Beta

95% CI Beta

P

VAP rate*

 

Mean change by month

  

Full model

Before and after training

0.50

0.29

0.84

0.009

 

Before and after ASS

1.05

0.60

1.85

0.856

 

Before and after inclinometer

0.26

0.09

0.74

0.011

 

Before and after oral care

0.02

0.01

0.03

0.117

Final model

Before and after training

0.51

0.34

0.78

0.002

 

Before and after inclinometer

0.45

0.24

0.84

0.013

 

Bundle

0.41

0.28

0.62

<0.001

Cost of antimicrobial/1,000 days of stay

     

Full model

(Constant)

56,800

29.84

83.77

0.000

 

Before and after training

-2.010

-45.11

41.09

0.925

 

Before and after ASS

-87.040

-133.81

-40.26

0.001

 

Before and after inclinometer

-37.030

-81.77

7.71

0.102

 

Before and after oral care

-12.060

-54.31

30.20

0.567

 

Monthly change

2.760

-0.58

6.10

0.102

Final model

(Constant)

59,110

33.93

84.30

0.000

 

Before and after ASS

-82,600

-122.64

-42.55

0.000

 

Before and after inclinometer

-37,840

-73.79

-1.90

0.040

 

Monthly change

2,420

0.35

4.50

0.023

 

Bundle

-17,840

-47.59

11.92

0.233

Days of MV/1,000 days of stay

     

Full model

(Constant)

489.47

402.19

576.75

0.000

 

Before and after training

-128.51

-268.02

11.00

0.070

 

Before and after ASS

-93.99

-245.38

57.39

0.216

 

Before and after inclinometer

-51.81

-196.61

92.99

0.473

 

Before and after oral care

26.75

-110.01

163.52

0.694

 

Monthly change

3.54

-7.26

14.34

0.511

Final model

(Constant)

507.17

439.70

574.65

0.000

 

Before and after training

-131.70

-207.35

-56.04

0.001

 

Bundle

-131.70

-207.35

-56.04

0.001

  1. *Data was expressed as incidence rate ratio by Poisson model.