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Table 3 Correlation between lung motion velocity in the left 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 0.14 [-0.08, 0.35] 0.199 -0.17 [-0.37, 0.06] 0.135 -0.02 [-0.24, 0.20] 0.852 -0.19 [-0.40, 0.03] 0.079
Sex 0.27 [0.05, 0.47] 0.013* -0.10 [-0.32, 0.12] 0.348 0.18 [-0.05, 0.38] 0.110 -0.27 [-0.46, -0.05] 0.013*
Height 0.08 [-0.15, 0.29] 0.500 -0.06 [-0.27, 0.17] 0.612 0.17 [-0.05, 0.38] 0.121 -0.31 [-0.50, -0.10] 0.004**
Weight 0.07 [-0.16, 0.29] 0.544 -0.05 [-0.26, 0.18] 0.681 0.22 [0, 0.42] 0.047* -0.30 [-0.49, 0.08] 0.006**
BMI 0.05 [-0.17, 0.27] 0.628 -0.04 [-0.26, 0.18] 0.695 0.17 [-0.06, 0.38] 0.131 -0.20 [-0.40, 0.02] 0.072
TV -0.05 [-0.27, 0.18] 0.663 0.05 [-0.18, 0.27] 0.667 0.13 [-0.09, 0.34] 0.232 -0.25 [-0.45, -0.03] 0.023*
VC -0.03 [-0.25, 0.20] 0.807 0.06 [-0.17, 0.28] 0.595 0.21 [-0.01, 0.42] 0.053 -0.23 [-0.43, -0.01] 0.038*
%VC -0.23 [-0.43, -0.01] 0.038* 0.12 [-0.10, 0.34] 0.261 0.15 [-0.08, 0.36] 0.186 -0.09 [-0.30, 0.14] 0.436
FEV1 -0.16 [-0.37, 0.06] 0.137 0.07 [-0.16, 0.28] 0.559 0.20 [-0.20, 0.41] 0.067 -0.06 [-0.28, 0.17] 0.613
FEV1% -0.21 [-0.42, 0.01] 0.052 0.02 [-0.20, 0.24] 0.858 0.09 [-0.13, 0.31] 0.405 0.08 [-0.14, 0.30] 0.446
%FEV1 -0.32 [-0.51, -0.10] 0.003** 0.11 [-0.11, 0.32] 0.338 0.13 [-0.10, 0.34] 0.245 0.10 [-0.13, 0.31] 0.396
  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