Table 1.
Descriptive statistics
| 1993–1999 | VETSA 1 | VETSA 3 | ||||
|---|---|---|---|---|---|---|
| Total N | Mean (STD)/N(%) | Total N | Mean (STD)/N(%) | Total N | Mean (STD)/N(%) | |
| Age Mean (STD) | 1123 | 55.9 (2.5) | 838 | 67.6 (2.4) | ||
| Ethnicity N (%) | 1144 | 1123 | 838 | |||
| White non-Hispanic | 1053 (92.1) | 1036 (92.3) | 770 (91.9) | |||
| Others | 91 (8) | 87 (7.8) | 68 (8.1) | |||
| Location (Urban/Rural) Mean N (%) | 1084 | 2.5 (1.9) | 1113 | 2.5 (1.9) | 831 | 2.6 (1.9) |
| Education Mean (STD) | 1144 | 13.9 (2.1) | 1123 | 13.9 (2.1) | 838 | 14 (2.1) |
| Family_income Mean (STD) | 1121 | 7.7 (3.2) | 1100 | 7.6 (3.2) | 827 | 7.8 (3.2) |
| APOE N (%) | 1136 | 1117 | 834 | |||
| APOE 4 non-carrier | 792 (69.7) | 786 (70.4) | 593 (71.1) | |||
| APOE 4 carrier | 344 (30.3) | 331 (29.6) | 241 (28.9) | |||
| PM2.5 (μm/m3) Mean (STD) | 1144 | 13.3 (2.8) | 1123 | 11.1 (2.8) | 838 | 11.1 (2.9) |
| NO2 (ppb) Mean (STD) | 1144 | 11.1 (6.4) | 1123 | 9.3 (5.2) | 824 | 9.3 (5.2) |
| Smoke Status | 1123 | 836 | ||||
| Never | 358 (31.9) | 279 (33.4) | ||||
| Former | 507 (45.2) | 446 (53.4) | ||||
| Current | 258 (23) | 111 (13.3) | ||||
| History of high cholesterol N (%) | 1121 | 337 (30.1) | 838 | 587 (70) | ||
| Hstory of Hypertension N (%) | 1121 | 643 (57.4) | 838 | 633 (75.5) | ||
| History of cardio/vascular event N (%) | 1121 | 131 (11.7) | 838 | 242 (28.9) | ||
| History of respiratory illness N (%) | 1121 | 96 (8.6) | 838 | 144 (17.2) | ||
| Drug abuse N (%) | 1120 | 14 (1.3) | 838 | 7 (0.8) | ||
| Alcohol use N (%) | 1121 | 837 | ||||
| No alcohol use in past 2 weeks | 386 (34.4) | 331 (39.6) | ||||
| >0 and <= 2 drinks per day | 581 (51.8) | 404 (48.3) | ||||
| > 2 drinks per day | 154 (13.7) | 102 (12.2) | ||||
| History of Stroke N (%) | 1121 | 22 (2) | 838 | 50 (6) | ||
| BMI Mean (STD) | 1119 | 29.3 (4.9) | 809 | 30 (5.4) | ||
| Depression Mean (STD) | 1115 | 8.2 (8.1) | 834 | 6.9 (7.5) | ||