Table 2.
Linear Regression Analyses of the Daily Step Count.
| B | 95%CI | Standardized β | p value | |
|---|---|---|---|---|
| Univariate | ||||
| Age, years | -87.2 | -218.7 to 44.2 | -0.18 | 0.189 |
| Body mass index, kg/m2 | 325.6 | 2.6 to 648.5 | 0.27 | 0,048 |
| FVC, percent predicted, % | 38.1 | -29.4 to 105.6 | 0.15 | 0.263 |
| DLCO, percent predicted, % | 42.4 | -13.3 to 97.8 | 0.20 | 0.133 |
| 6MWD, m | 14.5 | 3.9 to 25.1 | 0.35 | 0.009 |
| 6MWT, lowest SpO2, % | 173.6 | 6.3 to 340.8 | 0.28 | 0.042 |
| ESMCSA, cm2 | 2.1 | 0.6 to 3.7 | 0.36 | 0.007 |
| PMCSA, cm2 | 126.9 | -153.1 to 407.0 | 0.12 | 0.368 |
| PMV, cm3 | 8.4 | -5.7 to 22.4 | 0.16 | 0.236 |
| PMV index, cm3/m3 | 32.2 | -40.2 to 104.7 | 0.12 | 0.376 |
| Skeletal muscle index, kg/m2 | 866 | -257 to 1,990 | 0.26 | 0.128 |
| Handgrip strength, kg | 60.1 | -48.7 to 168.8 | 0.15 | 0.273 |
| Usual gait speed, m/s | 2,772 | -1,422 to 6,967 | 0.17 | 0.191 |
| HADS anxiety score | 93.8 | -194 to 382 | 0.09 | 0.517 |
| HADS depression score | -52.9 | -362 to 257 | -0.05 | 0.734 |
| Multiple | ||||
| 6MWD, m | 14.5 | 3.8 to 25.1 | 0.35 | 0.010 |
| ESMCSA, cm2 | 2.2 | 0.6 to 3.8 | 0.38 | 0.009 |
CI: confidence interval, FVC: forced vital capacity, DLCO: diffusion capacity of the lung for carbon monoxide, 6MWD: 6-minute walk distance, 6MWT: 6-minute walk test, SpO2: oxygen saturation by pulse oximetry, ESMCSA: cross-sectional area of erector spinae muscles, PMCSA: cross-sectional area of psoas major muscles, PMV: psoas major muscle volume, HADS: Hospital Anxiety and Depression Scale