Table 3.

Thoracic Ultrasound, Dyspnea Score, and 6-min Walk Test Correlation Results

Thoracic Ultrasound and Borg Dyspnea Scale	Pearson Correlation Coefficient (r)	p-value
Lung Ultrasound Score vs Borg Dyspnea Scale (Rest). N = 45	+ 0.4051	0.0058*
Lung Ultrasound Score vs Borg Dyspnea Scale (Exertion). N = 42	+ 0.3969	0.0093*
Diaphragm Excursion, quiet breathing vs Borg Dyspnea Scale (Rest). N = 38	− 0.0631	0.7065
Diaphragm Excursion, deep inspiration vs Borg Dyspnea Scale (Rest). N = 37	+ 0.0258	0.8794
Diaphragm Excursion, quiet breathing vs Borg Dyspnea Scale (Exertion) N = 36	+ 0.0081	0.9628
Diaphragm Excursion, deep inspiration vs Borg Dyspnea Scale (Exertion) N = 35	+ 0.0858	0.6240

Thoracic Ultrasound and 6-Minute Walk	Pearson Correlation Coefficient (r)	p-value
Lung Ultrasound Score vs. 6-Minute Walk Distance (feet) N = 40	− 0.4380	0.0047*
Lung Ultrasound Score vs. 6-Minute Walk Distance (% Predicted). N = 40	− 0.2689	0.0934
Lung Ultrasound Score vs. 6-Minute Walk SaO2 (nadir). N = 39	− 0.5506	0.0003*
Lung Ultrasound Score vs. 6-Minute Walk Distance Max HR	+ 0.0044	0.9792
Diaphragm Excursion, quiet breathing vs 6-Minute Walk Distance (feet). N = 35	+ 0.3255	0.0564**
Diaphragm Excursion, quiet breathing vs. 6-Minute Walk Distance (% Predicted). N = 35	+ 0.3425	0.0440*
Diaphragm Excursion, quiet breathing vs. 6-Minute Walk SaO2 (nadir). N = 34	+ 0.1173	0.5089
Diaphragm Excursion, quiet breathing vs. 6-Minute Walk Distance Max HR (bpm). N = 33	+ 0.0394	0.8277
Diaphragm Excursion, deep inspiration vs 6-Minute Walk Distance (feet). N = 34	+ 0.3676	0.0325*
Diaphragm Excursion, deep inspiration vs. 6-Minute Walk Distance (% Predicted). N = 34	+ 0.2656	0.1290
Diaphragm Excursion, deep inspiration vs. 6-Minute Walk SaO2 (nadir). N = 33	+ 0.2529	0.1557
Diaphragm Excursion, deep inspiration vs. 6-Minute Walk Distance Max HR	+ 0.0256	0.8874

Bold and asterisks are represents statistically significant p < 0.05

HR Heart rate