. 2014 Feb 19;4:604–614. doi: 10.1016/j.nicl.2014.02.001

Table 2.

Cognitive Testing Scores.

Cognitive test^a	Baseline score				Visit test score^b				Difference score^c
Cognitive test^a	Mean	SD	Min	Max	Mean	SD	Min	Max	Min	Max
RAVLT trials 2-5	41.6	5.9	29	55	42	6.3	25	57	− 12	14
RAVLT delayed recall	10.3	2.7	3	15	10.6	2.6	3	15	− 7	10
TMT part A	26.62	7.9	14	52	25.69	6.82	14	52	− 21	15
TMT part B	62.2	19.4	31	134	61.7	20.7	32	165	− 63	90

RAVLT = Rey Auditory Verbal Learning Test, TMT = Trail Making Test.

Test score on study visit closest to PiB scan.

Negative difference scores for TMT represent an improvement while positive scores represent a decline because the score is time to completion. Negative difference scores for RAVLT represent a decline while positive scores represent an improvement because the test is scored by the number of correct recalls, whereby more correct recalls implies better performance.