Table 2.
Multiple Linear Regression Model Summary for TMT-A, TMT-B and Digit symbol
| Dependent variables | Independent variables | |||||||
|---|---|---|---|---|---|---|---|---|
| Model 1 | Model 2 | |||||||
| HG | PPT | HG | PPT | |||||
| β (95% CI) | p-value | β (95% CI) | p-value | β (95% CI) | p-value | β (95% CI) | p-value | |
| TMT-A | −0.12 (− 0.55, 0.06) | 0.114 | −0.33 (−2.60, − 1.32) | < 0.001 | −0.33 (− 2.58, − 1.29) | < 0.001 | −0.09 (− 0.47, 0.10) | 0.177 |
| TMT-B | −0.02 (−1.11, 0.84) | 0.782 | − 0.12 (− 4.38, − 0.06) | 0.044 | −0.12 (− 4.38, − 0.04) | 0.046 | −0.01 (− 1.04, 0.90) | 0.888 |
| Digit symbola | 0.02 (− 0.39, 0.31) | 0.827 | 0.30 (1.08, 2.56) | < 0.001 | 0.30 (1.08, 2.56) | < 0.001 | 0.03 (−0.39, 0.28) | 0.751 |
Each of the regressions was performed separately for each independent variable (TMT-A, TMT-B, and digit symbol)
Model 1: includes two hand variables analyzed separately as independent variables and adjusted for age (a continuous variable), sex, years of education, TMIG-Index of Competence, GDS, hypertension, stroke, heart disease, diabetes and MMSE
Model 2: includes two hand variables analyzed together as independent variables and adjusted for the same covariates as Model 1
CI Confidence Interval, HG Handgrip strength, PPT Purdue Pegboard Test
aThe total number of subjects analyzed was 207