Table 1.

Self- and Proxy-Respondent Scoring and Prevalence of No Cognitive Impairment, Cognitive Impairment, Not Dementia (CIND), and Dementia, 2002 Health and Retirement Study (N=7,130).

	Mean (SD)	Prevalence (n)
Self-Respondent (n=6,040)
Short-term memory (0 to 20)	8.4 (3.5)
Working memory (0 to 5)	3.3 (1.8)
Speed of processing (0 to 2)	1.9 (0.5)
Total score (0 to 27), note: high score is better	13.6 (4.6)
No cognitive impairment (12 to 27)		68.4 (4133)
CIND (7 to 11)		23.9 (1446)
Dementia (0 to 6)		7.6 (461)
Proxy-Respondent (n=1,090)
IADL limitations (0 to 5)	2.4 (2.1)
Proxy memory assessment (0 to 4)	2.7 (1.2)
Interviewer cognitive impairment assessment (0 to 2)	1.1 (0.9)
Total score (0 to 11), note: high score is bad	6.2 (3.7)
No cognitive impairment (0 to 2)		24.5 (267)
CIND (3 to 5)		20.9 (228)
Dementia (6 to 11)		54.6 (595)