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A comparison between the characteristics of the experimental and control groups in this study.
| Characteristic | Experimental group, mean (SD) | Control group, mean (SD) | t test | P value |
| Age (years) | 67 (7) | 71 (5) | 1.53 | .14 |
| Education level (years) | 8 (4) | 11 (4) | 1.45 | .16 |
