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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