Table 4.

Result of random-effects model on CERAD word list delayed recall score over time

	Model 1		Model 2		Model 3
Variables	Coefficient (SE)	p Value	Coefficient (SE)	p Value	Coefficient (SE)	p Value
Time	-0.122* (0.045)	0.008	-0.163 (0.114)	0.156	-0.126 (0.119)	0.291
GBE	-0.384 (0.303)	0.206	-0.299 (0.292)	0.306	-0.376 (0.259)	0.147
Interaction of time & GBE (Time × GBE)	0.111 (0.057)	0.055	0.115* (0.057)	0.047	0.103 (0.056)	0.069
Adherence level during the first 6 months			0.017* (0.005)	0.002	0.012* (0.005)	0.016
Time × adherence level during the first 6 months			0.000 (0.001)	0.693	0.000 (0.000)	0.980
Age					-0.085 (0.053)	0.111
Female					0.592* (0.249)	0.018
Years of education					0.082* (0.039)	0.035
10-Items Center for Epidemiological Studies Depression Scale score					-0.150 (0.118)	0.203
Having one or more ApoE4 allele					-0.363 (0.342)	0.288
Modified Cumulative Illness Rating Scale					0.080 (0.041)	0.051
Numbers of prescription medication taken					-0.074 (0.069)	0.288
Mini Mental State Examination score					0.042* (0.083)	<0.001

^*Significant at p < 0.05.

GBE = Ginkgo biloba extract; CERAD = Consortium to Establish a Registry for Alzheimer's Disease.