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| Long (< = 0.75) vs. short (>0.75) RTL in PD | HR | p-value |
| Dementia progression within three year from baseline | 3.68 | 0.01 |
| Dementia progression within five year from baseline | 2.71 | 0.01 |
| Death during FU | 1.07 | 0.88 |
Age = covariate.
