Characteristics of study subjects by case and control status
| Characteristic | Case subjects (n = 901) | Control subjects (n = 913) | P value |
|---|---|---|---|
| Mean age (years ± SD) | 66.1 ± 6.2 | 66.2 ± 6.3 | 0.835 |
| Married or living as married | 588 (65.4%) | 576 (63.2%) | 0.333 |
| Ethnicity | 0.106 | ||
| Caucasian | 838 (93.2%) | 841 (92.3%) | |
| African-American | 19 (2.1%) | 23 (2.6%) | |
| Asian-American | 21 (2.4%) | 36 (4.0%) | |
| Other | 19 (2.1%) | 10 (0.6%) | |
| Educational level | 0.091 | ||
| ≤12 years | 373 (41.6%) | 368 (40.6%) | |
| >12 years to completed college | 392 (43.4%) | 416 (45.6%) | |
| More than college | 133 (15.0%) | 127 (14.0%) | |
| Annual income | 0.865 | ||
| <$25,000 | 293 (37.4%) | 293 (36.9%) | |
| $25,000–50,000 | 361 (46.1%) | 376 (47.3%) | |
| >$50,000 | 130 (16.6%) | 126 (15.6%) |
Data are n (%).