Memory Binding Test Predicts Incident Amnestic Mild Cognitive Impairment

Abstract

[Journal of Alzheimer’s Disease 53(4), 2016, 1585-1595, DOI: 10.3233/JAD-160291]

http://content.iospress.com/articles/journal-of-alzheimers-disease/jad160291

In the article, the variable called the number of Pairs In the Paired condition (PIP) was mischaracterized, though the main conclusions are not altered. The incorrect PIP measure included in the publication was the number of pairs scored based on single items cued recalled from List 1 and List 2 under the single list recall condition, not the number of pairs recalled under the paired condition. Reanalysis was performed.

On page 1588, the baseline PIP values should be corrected in Table 1 (corrected Table 1 included below,the corrected numbers are in bold font).

The last sentence in the main text on Page 1590, left panel, which was:

“Binding measure PIP was predictive using cut-scores of 8 and 9 (p≤0.01) but not predictive using the cut-scores of 10 and 11 (p = 0.07 and 0.51, respectively)”.

Should instead read:

“Binding measure PIP was predictive using cut-scores of 6 (p = 0.03) and 7 (p = 0.006) but not predictive usingthe cut-scores of 8, 9, 10 and 11 (p > 0.10)”.

Supplemental Tables 2, 3, 4, 5 and 8 were also revised (the revised supplemental file is available with the original article as published in the journal).

Table 1

Baseline characteristics for the whole sample and for groups stratified by incident aMCI status at follow-up^a

	Cognitively	No	Incident	p value^b
	Normal at Baseline	Incident aMCI	aMCI
Variable	(n = 246)	(n = 198)	(n = 48)
Age, mean (SD), years	79.7 (4.6)	79.3 (4.5)	81.5 (4.6)	0.003
Female, %	59.4	58.6	62.5	0.62
Race, %
White	67.9	68.7	64.6
Black	27.6	26.3	33.3	0.51
Other	4.5	5.0	2.1
Years of Education	13.8 (3.4)	13.9 (3.5)	13.4 (3.2)	0.19
WRAT-3	11.4 (2.3)	11.5 (2.2)	11.0 (2.6)	0.23
GDS score	2.1 (2.2)	2.0 (2.1)	2.8 (2.4)	0.01
Cumulative CVD events, %
0 CVD event	82.1	83.8	75.0
1 CVD event	16.7	15.7	20.8	0.08
2 CVD events	1.2	0.5	4.2
BIMC	1.9 (1.9)	1.8 (1.9)	2.4 (2.1)	0.03
MBT CR-L1	14.4 (1.7)	14.5 (1.5)	13.8 (2.3)	0.13
MBT CR-L2	11.6 (2.9)	11.8 (2.8)	10.5 (2.9)	0.004
MBT PIP	9.9 (3.8)	10.3 (3.6)	8.6 (3.9)	0.008
MBT TIP	24.9 (5.0)	25.4 (4.6)	22.8 (5.8)	0.004
FCSRT-FR^c	32.8 (5.6)	33.6 (5.0)	29.3 (6.6)	<0.0001
LM-I^c	22.1 (7.1)	22.9 (7.0)	19.0 (6.6)	0.0007
Follow up, median (IQR), years	3.8 (1.0, 6.7)	3.9 (1.1, 6.9)	2.9 (0.9, 5.7)	0.41

Abbreviations: aMCI = amnestic Mild Cognitive Impairment; WRAT-3 = Wide Range Achievement Test-Third Edition reading subtest grade score; GDS = Geriatric Depression Scale; CVD = Cardiovascular disease; BIMC = Blessed Information–Memory-Concentration test; MBT = Memory Binding Test; CR-L1 = Number of items Cued Recalled from List 1 on the MBT; CR-L2 = Number of items Cued Recalled from List 2 on the MBT; PIP = Number of Pairs cued recalled In the Paired condition on the MBT; TIP = Total number of Items cued recalled in the Paired condition on the MBT; FCSRT-FR = the Free and Cued Selective Reminding Test free recall; LM-I = Logical Memory I. ^aThis sample included 246 participants who were cognitively normal at baseline. The corresponding results including participants who were cognitive normal and naMCI at baseline are shown in Supplementary Table 4. ^bWilcoxon-Mann-Whitney tests were used to compare the continuous variables while Pearson’s Chi square tests and Fisher’s exact tests were used to compare categorical variables. ^cThese results may be circular because the FCSRT-FR and LM-I were available to the diagnosticians assigning a diagnosis at case conference.