Table 2.

Demographic characteristics by severity of memory impairment classification

Characteristic	No memory impairment	Memory impairment		P-value
		Early stage	Late stage
Age
Mean (SE)	72.59 (0.20)	73.42 (0.18)	74.53 (0.54)	<.0001
Age group (%)
65–74 years	64.26	53.91	46.50	<.0001
75–80 years	35.74	46.09	53.50
Female (%)	52.31	59.77	58.80	.0266
Race (%)
Caucasian	77.07	81.33	71.82	.0012
Black	9.54	7.19	7.43
Other	13.39	11.48	20.75
Comorbidity index
Mean (SE)	2.27 (0.08)	2.54 (0.07)	3.0 (0.17)	.0001
Median household income (%)
<$20,000 per year	18.92	19.41	25.49	.1385
<$20,000–$55,000 per year	40.91	43.71	40.54
>$55,000 per year	36.34	33.80	24.86
Missing	3.82	3.08	9.11
Education level (%)
Not completed high school	19.67	20.47	35.15	.0075
High school graduate	21.39	23.21	25.53
Some college	31.02	28.64	20.85
College graduate	27.84	27.65	17.00
BMI groups (%)
Normal (<25)	26.38	29.16	38.62	.0918
Overweight (25–29)	35.32	35.97	33.04
Obesity (≥30)	35.71	33.13	23.64

Abbreviations: SE, standard error; BMI, body mass index.