Table 3.

Linear mixed effects model examining the effects of time, MCI status and their interaction on category fluency performance

MCI
Variable	Estimate	t	95%CI	p-value
Time (0–20 s vs. 21–40 s)	−13.24	−50.86	[−13.75, −12.73]	<.001
Time (0–20 s vs. 41–60 s)	−16.96	−61.91	[−17.50, −16.42]	<.001
Age	−0.02	−3.76	[−0.03, −0.01]	<.001
Education	0.26	22.31	[0.24, 0.29]	<.001
Gender	−0.05	−0.75	[−0.20, 0.09]	.455
GHS	0.003	−0.12	[−0.07, 0.06]	.90
GDS	− 0.01	−0.96	[−0.03, 0.01]	.34
BAI	−0.002	−0.37	[−0.02, 0.01]	.71
Categroy Flunecy z-score	2.51	84.02	[2.45, 2.57]	<.001
MCI	−1.85	−4.00	[−2.76, −0.94]	<.001
MCI*Time
(0–20 s vs. 21–40 s)	2.22	3.14	[0.83 to 3.62]	.002
(0–20 s vs. 41–60 s)	3.16	4.24	[1.70 to 4.63]	<.001

Note. Category Fluency z-score was based on the total number of words generated and was calculated using age and education corrected published local norms.

MCI= mild cognitive impairment; GHS= General Health Status; GDS= Geriatric Depression Scale; BAI= Beck Anxiety Inventory.