Table 2.

Sociodemographic characteristics of Sister Study participants and incomplete enrollees (passive cohort) at baseline, 2003–2009.

Characteristic	Study participants		Passive cohort
	$n$	(%)a	$n$	(%)a
Participants	50,884	100.0	3,066	100.0
Year of enrollment
2003	843	1.7	24	0.8
2004	13,297	26.1	569	18.6
2005	7,712	15.2	389	12.7
2006	7,161	14.1	411	13.4
2007	13,717	27.0	970	31.6
2008	6,616	13.0	538	17.6
2009	1,538	3.0	165	5.4
Age at baseline (y)
35–39	2,100	4.1	189	6.2
40–44	4,479	8.8	435	14.2
45–49	7,703	15.1	606	19.8
50–54	9,817	19.3	657	21.4
55–59	10,109	19.9	547	17.8
60–64	7,803	15.3	333	10.9
65–69	5,824	11.4	190	6.2
70–74	3,049	6.0	109	3.6
Median (range) (y)	55.6 (25.0–76.5)		52.1 (35.1–78.5)
Race/ethnicity
Non-Hispanic white	42,558	83.7	1,939	63.4
Non-Hispanic black	4,462	8.8	723	23.6
Hispanic	2,515	4.9	293	9.6
Other	1,334	2.6	106	3.5
Unknown or missing	15		5
Marital status
Never married	2,759	5.4	264	8.6
Divorced/separated	7,550	14.8	700	22.9
Widowed	2,564	5.0	167	5.5
Legally married	35,870	70.5	1,748	57.1
Living as married	2,127	4.2	180	5.9
Missing	14		7
Education
Less than high school	627	1.2	72	2.4
High school/GED	7,178	14.1	542	17.7
Some college, no degree	9,957	19.6	751	24.6
Associate or technical  degree	7,224	14.2	531	17.4
Bachelor’s degree	13,714	27.0	672	22.0
Master’s degree	10,103	19.9	398	13.0
Doctoral degree	2,069	4.1	92	3.0
Missing	12		8
Household income
$<\$\mathrm{20,000}$	2,296	4.7	247	8.5
$\$\mathrm{20,000}–\mathrm{49,999}$	10,284	21.0	775	26.7
$\$\mathrm{50,000}–\mathrm{99,999}$	19,907	40.7	1,082	37.3
$\$\mathrm{100,000}–\mathrm{200,000}$	12,868	26.3	625	21.5
$>\$\mathrm{200,000}$	3,534	7.2	174	6.0
Missing	1,995		163
Household Size
1	8,991	17.7	667	21.9
2	24,228	47.7	1,157	38.1
3	7,216	14.2	497	16.3
4	6,782	13.4	468	15.4
$\ge 5$	3,548	7.0	252	8.3
Missing	119		25
Mean (range)	2.47 (1–20)		2.55 (1–11)
Household members $<18\mathrm{y}$ of age
0	37,318	73.5	1,940	63.8
1	6,249	12.3	508	16.7
2	5,005	9.9	399	13.1
$\ge 3$	2,187	4.3	194	6.4
Missing	125		25
Mean (range)	0.46 (0–11)		0.65 (1–7)
U.S. Census region
Northeast	8,532	16.8	500	16.6
Midwest	13,689	26.9	649	21.5
South	16,743	32.9	1,215	40.2
West	11,010	21.7	607	20.1
Puerto Rico	883	1.7	51	1.7
Missing	27		44

^aTotal percentages may not always equal 100% due to missing values and rounding.