Table 2 Descriptive statistics for subjects included in analyses versus those excluded owing to missing data at 1991 follow-up
| Variable | Subjects with complete 1991 data, n = 684 | Died by 1991, n = 71 | Subjects with missing 1991 data, n = 434 | p 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, 1988 | 53.8 (9.7)1 | 52.4 (11.0) | 51.6 (9.9)1 | 0.002 |
| % low | 47.72 | 58.0 | 57.32 | 0.004 |
| Change in cognitive score, 1988–1991 | 0.26 (7.2) | — | 0.54 (6.8) | 0.6 |
| % declined | 34.0 | — | 33.1 | 0.7 |
| IL-6, pg/mL | 4.54 (5.6) | 6.16 (7.1)3 | 4.01 (4.4)3 | 0.05 |
| % middle tertile | 33.04 | 28.34,5 | 36.45 | — |
| % top tertile | 32.74 | 52.84,5 | 30.15 | 0.03 |
| Age, y | 74.2 (2.8) | 74.6 (2.5) | 74.3 (2.7) | 0.6 |
| Men, % | 456 | 706,7 | 407 | 0.001 |
| Race, % nonwhite | 18 | 15 | 20 | 0.5 |
| Education, y | 10.8 (3.3) | 10.7 (3.7) | 10.3 (3.2) | 0.1 |
| Av. annual income, $ | 16,310 | 16,515 | 13,326 | 0.001 |
| (12,556)8 | (13,232) | (11,440)8 | — | |
| Body mass index, kg/m2 | 26.1 (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, % | 439 | 41 | 349 | 0.007 |
| Ever smoker, % | 51 | 62 | 53 | 0.16 |
| Activity score | 22.0 (26.9) | 19.4 (25.6) | 19.0 (26.3) | 0.16 |
| Diabetes mellitus, % | 14 | 11 | 12 | 0.7 |
| Cancer, % | 19 | 21 | 16 | 0.4 |