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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