Table 4.

Significant Correlations Between Patient Characteristics and Daily Steps

	All Patients		COPD		HYPOX		LTOT
R	P	R	P	R	P	R	P
Age, years	−0.2853	<0.001	−0.4581	<0.001	−0.3151	0.012
BMI, kg/m2
6MWD, m	0.5798	<0.001	0.5106	<0.001	0.5736	<0.001	0.5418	<0.001
Mean SpO2 during 6MWD, %	0.1692	0.023
FEV1, % pred.	0.3054	<0.001					0.4725	0.002
FVC, % pred.	0.2893	<0.001			0.3173	0.017
FEV1/FVC,%	0.1692	0.023
RV, % pred.	−0.1878	0.023			−0.3149	0.040
CI, score	0.1651	0.027					−0.3955	0.015
SI, score							−0.3653	0.026
PaO2/FiO2	0.5222	<0.001	0.3700	0.001	0.5453	<0.001	0.4298	0.005
PaCO2, mmHg
MVC quadriceps, Kg	0.3043	<0.001	0.2502	0.014	0.4453	<0.001
MVC biceps, kg	0.2991	<0.001			0.4921	<0.001
MIP, cmH2O	0.1693	0.017	0.2223	0.029	0.3039	0.015
MEP, cmH2O	0.2489	0.001			0.4050	0.001
EQ-5D, score							0.4721	0.007
EQ-5D-VAS	0.2896	0.001

Notes: Color legend: pale yellow = weak correlation (r=|0-0.299|), pale pink = moderate correlation (r=|0.3–0.499|), red = strong correlation (r >|0.5|), grey= no significant correlation.³⁰

Abbreviations: BMI, Body-Mass Index; CI, Comorbidity Index; EQ-5D, EuroQol five dimension questionnaire; EQ-5D-VAS, EuroQol five dimension – VAS; FEV₁, Forced Expiratory Flow in one second; FVC, Forced Vital Capacity; MIP, Maximal Inspiratory Pressure; MEP, Maximal Expiratory Pressure; MVC, Maximal Voluntary Contraction; PaCO², arterial carbon dioxide tension; PaO₂, arterial oxygen tension; RV, Residual volume; SI, Severity Index; 6MWD, Six minute walk distance.