Table 2 Descriptive statistics for subjects included in analyses versus those excluded owing to missing data at 1991 follow-up

VariableSubjects with complete 1991 data, n = 684Died by 1991, n = 71Subjects with missing 1991 data, n = 434p Value for F test for differences between groups
Values are means (SD) or percentages. The p values reflect F tests for continuous variables and χ2 tests for categorical variables. Where overall test was significant, groups with the same superscript have significant post hoc differences between them.
IL-6 = interleukin-6; HBA1c = hemoglobin A1c.
Cognitive scores, 198853.8 (9.7)152.4 (11.0)51.6 (9.9)10.002
    % low47.7258.057.320.004
Change in cognitive score, 1988–19910.26 (7.2)0.54 (6.8)0.6
    % declined34.033.10.7
IL-6, pg/mL4.54 (5.6)6.16 (7.1)34.01 (4.4)30.05
    % middle tertile33.0428.34,536.45
    % top tertile32.7452.84,530.150.03
Age, y74.2 (2.8)74.6 (2.5)74.3 (2.7)0.6
Men, %456706,74070.001
Race, % nonwhite1815200.5 
Education, y10.8 (3.3)10.7 (3.7)10.3 (3.2)0.1
Av. annual income, $16,31016,51513,3260.001
(12,556)8(13,232)(11,440)8
Body mass index, kg/m226.1 (4.2)25.1 (3.9)26.0 (4.2)0.2
Average HBA1c, %6.8 (1.9)7.2 (2.8)6.6 (1.4)0.03
Any alcohol last mo, %439413490.007
Ever smoker, %5162530.16
Activity score22.0 (26.9)19.4 (25.6)19.0 (26.3)0.16
Diabetes mellitus, %1411120.7 
Cancer, %1921160.4