Table 3. Paired-sample t-test for cognitive assessment (baseline and follow-up) (n=5,949).

Cognitive assessment	t	p-value	r
CERAD WLT Learning	-3.46	< 0.001	0.04
CERAD WLT Recall	-5.57	< 0.001	0.07
CERAD WLT Recognition	-7.78	< 0.001	0.10
Trail Making Test	-3.98	< 0.001	0.05
Semantic verbal fluency	-11.12	< 0.001	0.14
Phonemic verbal fluency	12.86	< 0.001	0.16

Neuropsychological tests are standardized in z-scores.

CERAD WLT = word list from the Consortium to Establish a Registry for Alzheimer’s Disease.

The equated follow-up verbal fluency scores were used for the comparison.