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Table 3 Differences between groups at variable negative pressure

From: Diaphragm thickening fraction to predict weaning—a prospective exploratory study

Diaphragm parameters

Weaning groups

(N = 64)

Negative pressure trigger

(N = 64)

 

Median (IQR)

Simple (n = 33)

Complicated (n = 31)

2

4

6

T-piece

p ##

p ###

∆2–4

∆4–6

∆2–6

DTi, mm

Simple

2.2 (2.1–2.3)

2.2 (2.2–2.3)

2.2 (2.2–2.3)

2.2 (2.2–2.2)

< 0.001*

< 0.001*

< 0.001*

<0.001*

Complicated

2.0 (2.0–2.1)

2.1 (2–2.2)

2.0 (2.0–2.2)

2.0 (2.0–2.2)

< 0.001*

< 0.001*

< 0.001*

0.004

p #

< 0.001

< 0.001

< 0.001

< 0.001

    

DTe, mm

Simple

1.7 (1.6–1.7)

1.7 (1.7–1.8)

1.7 (1.7–1.8)

1.7 (1.6–1.8)

< 0.001*

< 0.001*

0.82

<0.001*

Complicated

1.6 (1.5–1.7)

1.7 (1.6–1.8)

1.6 (1.6–1.8)

1.7 (1.6–1.8)

0.001

< 0.001*

0.03

0.006

p #

0.22

0.31

0.10

0.16

    

DTf, %

Simple

31 (28–32)

31 (28–35)

29 (26–32)

29 (26–33)

0.010

0.40

0.001

0.05

Complicated

22 (17–24)

22 (18–27)

23 (18–25)

21 (17–25)

0.34

0.94

0.28

0.50

p #

< 0.001

< 0.001

< 0.001

< 0.001

    

AMP, cm

Simple

1.3 (1.3–1.5)

1.3 (1.3–1.5)

1.3 (1.2–1.4)

1.3 (1.2–1.4)

< 0.001*

< 0.001*

< 0.001*

0.49

Complicated

1.2 (1.1–1.2)

1.2 (1.1–1.3)

1.2 (1.1–1.2)

1.2 (1.1–1.2)

< 0.001*

< 0.001*

0.01

<0.001*

p #

< 0.001

< 0.001

< 0.001

< 0.001

    

SPcont, cm/s

Simple

1.3 (1.3–1.3)

1.3 (1.3–1.4)

1.3 (1.3–1.4)

1.3 (1.2–1.3)

< 0.001*

0.001

< 0.001*

0.36

Complicated

1.2 (1.1–1.2)

1.2 (1.1–1.3)

1.2 (1.1–1.3)

1.2 (1.1–1.3)

0.001

< 0.001*

0.97

<0.001*

p #

< 0.001

< 0.001

< 0.001

< 0.001

    
  1. Note: Tests of statistical significance used for p values: p #, Mann-Whitney U test; p ##, Friedman ANOVA test; p ###, Wilcoxon signed rank test; p*, < 0.001 highly significant
  2. Abbreviations: DTi thickness of diaphragm during inspiration, DTe thickness of diaphragm during expiration, TP T-piece, DTf diaphragm thickening fraction, AMP amplitude of diaphragm, SPcont speed of contraction of diaphragm