Table 1.
Demographic results.
| Cases | Controls | Significance | |
|---|---|---|---|
| Number of subjects | N = 67 | N = 68 | |
| Age: mean ± SD | 71.1 ± 7.5 | 72.2 ± 7.1 | p = 0.38 |
| Age at beginning of military service: mean ± SD | 20.4 ± 2.6 | 21.2 ± 3.3 | p = 0.09 |
| Service duration: mean ± SD | 4.9 ± 6.6 | 5.4 ± 6.7 | p = 0.63 |
| Marital status at reference year: percent (N) | p = 0.12 | ||
| Married | 97.0% (65) | 89.7% (61) | |
| Divorced | 1.5% (1) | 8.8% (6) | |
| Never married | 1.5% (1) | 1.5% (1) | |
| Annual income at reference year: percent (N) | p = 0.14 | ||
| Less than $50,000 | 43.3% (29) | 26.5% (18) | |
| $50,000–$79,999 | 26.9% (18) | 27.9% (19) | |
| Greater than $80,000 | 25.4% (17) | 41.2% (28) | |
| Did not report | 4.5%(3) | 4.4% (3) | |
| Highest level of education: percent (N) | p < 0.001 | ||
| High school education or less | 55.2% (37) | 23.5% (16) | |
| Greater than high school education | 44.8% (30) | 76.5% (52) | |
| Years of schooling completed: mean ± SD | 14.0 ± 2.8 | 16.2 ± 3.3 | p < 0.001 |
| Ethnicity: percent (N) | p = 0.50 | ||
| White or European-American | 98.5% (66) | 100.0% (68) | |
| Black or African American | 1.5% (1) | 0.0% (0) | |
| Employment at reference year: percent (N) | p = 0.40 | ||
| Full-time employed | 79.1% (53) | 70.6% (48) | |
| Part-time employed | 1.5% (1) | 4.4% (3) | |
| Retired | 19.4% (13) | 25.0% (17) | |
| Dementia screening tools: mean ±SD | |||
| Cases–MMSE | 27.0 ± 2.1 | N/A | |
| Controls–TICS | N/A | 36.5 ± 3.5 |
There was a significant difference between the highest level of education obtained and the years of schooling completed, as previously reported. There were no other between group differences. SD, Standard deviation; MMSE, Mini-Mental Status Exam; TICS, Telephone Interview for Cognitive Status.