Table 1.

Baseline demographic characteristics of eligible respondents

Characteristic	N (%)
Female sex	3,551 (58.42)
Education
Less than high school	1,585 (26.32)
High school graduate or equivalent	3,088 (51.27)
College graduate or beyond	1,350 (22.41)
Race/ethnicity
Non-Hispanic white	4,193 (68.99)
Non-Hispanic black	1,316 (21.65)
Hispanic	353 (5.81)
Other minorities	216 (3.55)
Social network structure
Having at least one family member within a social network	4,942 (81.66)
Having at least one friend within a social network	1,059 (17.50)
Having at least one college-educated family member within a social network	1,820 (30.07)
Total	6,078
	Mean (SD), N
Age at baseline	77.49 (7.79), 6,078
Follow-up time (y)	4.72 (1.61), 6,078
Social network size	1.93 (1.29), 5,709
Number of family members within a social network	1.51 (1.21), 6,052
Number of friends within a social network	0.25 (0.61), 6,052

Analytic sample includes NHATS respondents who had at least two waves of cognitive status during the follow-up period of 2011-2016. SD, standard deviation.