Table 3.
Mean (SD) of the Telephone Interview of Cognitive Status and the Composite Score by Baseline Characteristic
| TICSa (N=3024) |
Composite Scoreb (N=2461) |
|||||
|---|---|---|---|---|---|---|
| Baseline Characteristic | Mean | SD | P-value | Mean | SD | P-value |
| Age tertile, y | ||||||
| 1: 50−70 | 34.0 | 3.1 | <.001 | 2.3 | 5.0 | <.001 |
| 2: 71−78 | 33.0 | 3.4 | 0.1 | 5.0 | ||
| 3: 79+ | 31.9 | 3.3 | −1.8 | 5.1 | ||
| Sex | ||||||
| Female | 33.4 | 3.3 | <.001 | 0.9 | 5.1 | <.001 |
| Male | 32.5 | 3.3 | −0.4 | 5.4 | ||
| Race | ||||||
| White | 33.1 | 3.3 | <.001 | 0.4 | 5.2 | 0.002 |
| Black | 31.0 | 3.4 | −2.1 | 5.2 | ||
| Asian | 31.8 | 3.9 | −1.2 | 5.5 | ||
| American Indian | 28.8 | 6.0 | −4.5 | 8.2 | ||
| Native Hawaiian or Other Pacific Islander | 29.3 | 3.1 | −10.3 | –d | ||
| Other | 30.0 | 3.6 | −2.0 | 5.1 | ||
| Education | ||||||
| High school or less | 31.7 | 3.5 | <.001 | −2.4 | 5.0 | <.001 |
| At least some college | 33.4 | 3.1 | 0.7 | 4.9 | ||
| Post-graduate | 34.0 | 3.0 | 2.9 | 4.9 | ||
| Smoking status | ||||||
| Never | 33.2 | 3.3 | 0.01 | 0.5 | 5.2 | 0.45 |
| Former | 32.9 | 3.4 | 0.3 | 5.3 | ||
| Current | 32.6 | 3.5 | 0.0 | 5.7 | ||
| Aspirin use | ||||||
| No | 33.1 | 3.4 | 0.20 | 0.5 | 5.4 | 0.21 |
| Yes | 32.9 | 3.3 | 0.2 | 5.1 | ||
| Statin use | ||||||
| No | 33.3 | 3.3 | <.001 | 0.7 | 5.3 | <.001 |
| Yes | 32.7 | 3.4 | −0.1 | 5.2 | ||
| CES-D score≥16 | ||||||
| No | 33.2 | 3.3 | <.001 | 0.7 | 5.2 | <.001 |
| Yes | 32.7 | 3.4 | −0.2 | 5.3 | ||
| History of: | ||||||
| Hypertension | ||||||
| No | 33.4 | 3.2 | <.001 | 0.9 | 5.3 | <.001 |
| Yes | 32.8 | 3.5 | −0.1 | 5.2 | ||
| Congestive heart failure | ||||||
| No | 33.1 | 3.3 | <.001 | 0.4 | 5.2 | <.001 |
| Yes | 31.3 | 3.8 | −1.6 | 5.2 | ||
| Coronary heart disease | ||||||
| No | 33.2 | 3.3 | <.001 | 0.6 | 5.2 | <.001 |
| Yes | 31.7 | 3.4 | −2.3 | 4.8 | ||
| Myocardial infarction | ||||||
| No | 33.1 | 3.3 | <.001 | 0.5 | 5.2 | <.001 |
| Yes | 31.6 | 3.9 | −1.9 | 5.6 | ||
| Stroke | ||||||
| No | 33.1 | 3.3 | <.001 | 0.5 | 5.2 | <.001 |
| Yes | 31.8 | 3.7 | −1.7 | 5.5 | ||
TICS, Telephone Interview of Cognitive Status; (TICS-M)3 is a version of the Mini Mental State Examination. The TICS score ranges from 0 to 39 points. The higher score denotes better cognitive function.
Composite score. A composite score was constructed by including the score of all 8 cognitive tests by converting all test results into z-scores and then adding the z-scores. The composite score was computed to obtain an overall score for the battery of cognitive function tests, ranging from −22 to 17, with higher scores representing better function.
Parameter estimate and standard error of a linear regression.
N=1.
P-values are from an analysis of covariance comparing the means.