Table 1.

Characteristics of the Study Population, Overall and by Clinical Groups

	Weighted Percentage*
	Total	Relatively Healthy	Self-Management Difficulty	Uncertain Benefit
	n = 3,507 representing 13.6 million	n = 1,836 representing 7.7 million	n = 1,164 representing 4.3 million	n = 507 representing 1.6 million
Age (years)
51–64	47.4 (6.4 million)	55.7 (4.3 million)	40.8 (1.7 million)	24.9 (400,000)
65–75	30.5 (4.1 million)	30.7 (2.4 million)	29.8 (1.3 million)	31.0 (500,000)
≥76	22.2 (3.0 million)	13.6 (1.0 million)	29.3 (1.2 million)	44.1 (700,000)
p Value				<.001
Gender
Female	51.3	46.5	57.3	58.6
p Value				<.001
Race
White	75.1	81.4	67.9	64.3
African American	15.3	12.1	18.3	22.3
Hispanic	9.6	6.5	13.8	13.4
p Value				<.001
Living arrangement
Married	59.6	66.8	51.0	48.0
Unmarried living with other(s)	17.1	12.8	22.8	22.8
Unmarried living alone	23.3	20.4	26.2	29.2
p Value				<.001
Education (years)
<12	30.4	16.7	45.0	57.2
12	33.2	35.5	32.0	25.5
>12	36.4	47.9	23.0	17.3
p Value				<.001
Net worth (dollars)
≤40,000	34.5	24.7	43.3	58.0
40,001–155,000	29.0	30.5	27.6	25.9
155,001–420,000	22.6	27.2	18.9	10.4
>420,000	13.9	17.7	10.3	5.7
p Value				<.001

Note: Population estimates for the age groups are rounded to the nearest 100,000. The columns present the percentages of the total population (column 1) and the respective clinical groups (columns 2, 3, and 4) for each variable. Proportions are related to the columns and not the rows; the columns for each variable (not the rows) add to 100%. For example, of those respondents in the Relatively Healthy Group, 55.7% are 51–64 years old, 30.7% are 65–75 years old, and 13.6% are 76 years and older. p Value from the χ² test for the association between the indicated variable and belonging to the Clinical Groups.

^*Weighted percentages (and population estimates) were derived using Health and Retirement Study respondent population weights to adjust for differential probability of selection into the sample and differential nonresponse.