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. Author manuscript; available in PMC: 2009 Oct 19.
Published in final edited form as: J Int Neuropsychol Soc. 2008 Mar;14(2):266–278. doi: 10.1017/S1355617708080302

Table 2.

Change points and rates of decline on executive function tests during the preclinical course of dementia

Test Time of accelerated decline (change point) Pre-change point rate of decline Post-change point rate of decline
Category Fluency 3.0 years (95% CI: 1.7,5.0) 1.97 points/year (95% CI: 1.50, 2.45) 3.50 points/year (95% CI: 2.91, −4.09)
Letter Fluency 2.5 years (95% CI: 1.5, 4.9) 0.91 points/year (95% CI: .23, 1.33) 3.21 points/year (95% CI: 2.25, 3.91)
Trailmaking Speed 2.9 years (95% CI: 1.1, 8.3) 1.90 per minute per year (95% CI: 1.07, 2.73) 3.36 per minute per year (95% CI: 2.48, 4.24)

Note. CI = confidence interval.