Table 3.
Regression Analysis to Predict DHI Scores from Covariates, SOT and LOS
| Model 1 (SOT & LOS) | Model 2 (SOT) | Model 3 (LOS) | |
|---|---|---|---|
| Statistical analysis | |||
| R2 | 0.65 | 0.55 | 0.58 |
| Cp | 12.25 | 5.38 | 9.02 |
| Cp - P |
0.25 |
0.38 |
0.02 |
| |
Beta (CI) |
Beta (CI) |
Beta (CI) |
| Predictor Variables | |||
| Covariates | |||
| Age | −0.09 (−0.67, 0.43) | — | −0.01 (−0.48, 0.46) |
| Time post-injury | 0.01 (−0.02, 0.04) | 0.001 (−0.003, 0.006) | 0.003 (−0.02, 0.03) |
| Medication use | 13.27 (−3.58, 37.90) | 12.59 (1.25, 28.25) | 16.73 (2.08, 35.00) |
| BDI | 1.24 (−0.08, 2.51) | 1.07 (0.20, 2.04) | 1.13 (0.05, 2.23) |
| Total no. of HI | −3.82 (−9.79, 1.72) | −2.34 (−5.48, −0.17) | −2.76 (−7.27, 1.31) |
| SOT | |||
| SOM | — | — | |
| VIS | −0.48 (−1.74, 0.86) | −0.15 (−0.66, 0.41) | |
| VEST | −0.17 (−0.80, 0.36) | — | |
| PREF | −0.39 (−1.41, 0.51) | — | |
| Comp | — | — | |
| LOS | |||
| RT | −31.70 (−95.46, 17.50) | −7.67 (−49.30, 33.71) | |
| MVL | −0.30 (−8.97, 6.67) | 0.70 (−6.24, 7.46) | |
| EPE | −0.08 (−1.08, 0.96) | 0.01 (−0.98, 1.03) | |
| MXE | — | −0.24 (−1.25, 1.12) | |
| DCL | 0.40 (−1.21, 2.00) | — | |
Best-fit models were built using different subsets of variables. Model 1 was fit on all possible covariates and predictors, Model 2 was fit on covariates and SOT, and Model 3 was fit on all covariates and LOS. Variables not included by least angle regression in the best-fit models are marked.
Bold values indicate equivalence to a p-value.
DHI, Dizziness Handicap Inventory; SOT, Sensory Organization Test; LOS, Limits of Stability; CI, confidence interval; BDI, Beck Depression Inventory; HI, head injuries; SOM, Somatosensory Score; VIS, Visual Score; VEST, Vestibular Score; PREF, Preference Score; Comp, Equilibrium Composite Score; RT, Reaction Time Composite Score; MVL, Movement Velocity Composite Score; EPE, End-Point Excursion Composite Score; MXE, Maximum Excursion Composite Score; DCL, directional control.