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Table 2 Correlation between lung motion velocity in the right lung and demographic data

From: Vector-field dynamic x-ray (VF-DXR) using optical flow method in patients with chronic obstructive pulmonary disease

Variables

Tidal inspiration

Tidal expiration

Forced inspiration

Forced expiration

rs [95% CI]

p value

rs [95% CI]

p value

rs [95% CI]

p value

rs [95% CI]

p value

Age

0.34 [0.13, 0.52]

0.002**

-0.32 [-0.51, -0.11]

0.003**

0.09 [-0.13, 0.31]

0.404

-0.27 [-0.46, -0.05]

0.015*

Sex

0.20 [-0.02, 0.41]

0.068

-0.08 [-0.30, 0.14]

0.446

0.11 [-0.11, 0.33]

0.315

-0.25 [-0.45, -0.03]

0.023*

Height

0.07 [-0.15, 0.29]

0.500

-0.04 [-0.26, 0.18]

0.719

0.08 [-0.14, 0.30]

0.450

-0.30 [-0.49, -0.08]

0.007**

Weight

0.06 [-0.16, 0.28]

0.571

-0.05 [-0.27, 0.17]

0.656

0.05 [-0.17, 0.27]

0.657

-0.26 [-0.46, -0.04]

0.016*

BMI

0.06 [-0.17, -0.28]

0.595

-0.07 [-0.28, 0.16]

0.552

0.05 [-0.18, 0.27]

0.679

-0.16 [-0.37, 0.07]

0.157

TV

0.14 [-0.08, 0.35]

0.198

-0.17 [-0.38, 0.05]

0.120

0.16 [-0.06, 0.37]

0.144

-0.27 [-0.46, -0.05]

0.015*

VC

-0.19 [-0.40, 0.03]

0.073

0.12 [-0.10, 0.33]

0.278

-0.03 [-0.25, 0.19]

0.764

-0.14 [-0.35, 0.08]

0.194

%VC

-0.26 [-0.46, -0.04]

0.017*

0.11 [-0.11, 0.33]

0.309

-0.05 [-0.27, 0.18]

0.689

-0.05 [-0.27, 0.18]

0.664

FEV1

-0.40 [-0.57, -0.20]

<0.001**

0.26 [0.05, 0.46]

0.016*

-0.08 [-0.30, 0.18]

0.448

0.08 [-0.14, 0.30]

0.454

FEV1%

-0.42 [-0.59, -0.22]

<0.001**

0.25 [0.03, 0.45]

0.021*

-0.16 [-0.37, -0.06]

0.146

0.25 [0.03, 0.44]

0.025*

%FEV1

-0.47 [-0.63, -0.28]

<0.001**

0.25 [0.03, 0.45]

0.024**

-0.10 [-0.31, 0.12]

0.385

0.18 [-0.05, 0.25]

0.114

  1. Spearman’s rank correlation coefficient (rs) was calculated. *p < 0.05; **p < 0.01. BMI Body mass index, CI Confidence interval, FEV1 Forced expiratory volume in one second, FEV1% Forced expiratory volume percent in one second divided by forced vital capacity, %FEV1 Percent predicted forced expiratory volume in one second, GOLD Global initiative for chronic obstructive lung disease, LMV Lung motion velocity, TV Tidal volume, VC Vital capacity; %VC Percent predicted vital capacity