Table 3 Characteristics of patients, changes in breathing pattern, diaphragm function, and diaphragm shear modulus in patients with and without a significant correlation between changes in transdiaphragmatic pressure and changes in diaphragm shear modulus

Patients’ characteristics

Age, years

62 (57 to 71)

73 (60 to 79)

 < 0.001

Body mass index, kg·m⁻²

24.6 (18.0 to 27.0)

25.8 (23.2 to 30.4)

0.224

Breathing pattern

V_T, mL/kg

4.8 (3.9 to 6.0)

4.6 (3.8 to 6.1)

0.818

Respiratory rate, cycles/min

21 (15 to 26)

25 (18 to 33)

 < 0.001

Diaphragm function

ΔPdi, cmH₂O

7.5 (3.3 to 16.9)

6.0 (1.8 to 13.2)

0.086

PTPdi, cmH₂O.s/breath

4.5 (1.9 to 10.6)

4.3 (1.2 to 8.0)

0.019

PTPdi, cmH₂O.s/min

91 (34 to 260)

102 (24 to 189)

0.088

ΔPes, cmH₂O

−6.4 (−13.2 to −1.9)

−6.5 (−13.3 to −1.9)

0.443

ΔPga, cmH₂O

1.5 (0.1–2.6)

0.6 (0.1–1.6)

0.004

ΔSMdi, kPa

9.4 (4.5–14.1)

6.3 (4.1–9.9)

 < 0.001