Table 2.
Selected characteristics of study participants by quartiles of forced expiratory volume in 1 second (FEV1), men, ARIC Study, 1990–1992. Numbers correspond to means (standard deviation) or percentages.
| FEV1 | ||||
|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | |
| N | 1185 | 1189 | 1168 | 1194 |
| FEV1, range, L | <2.8 | 2.8–3.3 | 3.4–3.7 | >3.7 |
| mean (SD), L | 2.3 (0.5) | 3.0 (0.1) | 3.5 (0.1) | 4.1 (0.4) |
| FVC, L | 3.5 (0.6) | 4.2 (0.4) | 4.6 (0.4) | 5.4 (0.5) |
| Age, years | 59.7 (5.4) | 57.7 (5.7) | 56.5 (5.5) | 54.2 (5.0) |
| Race, % African-Americans | 29.9 | 24.2 | 13.0 | 6.9 |
| Education | ||||
| Less than high school | 29.2 | 22.2 | 13.5 | 8.3 |
| High school completed | 36.5 | 36.9 | 39.2 | 35.8 |
| College degree | 34.3 | 40.9 | 47.3 | 56.0 |
| Current smoker, % | 37.1 | 25.5 | 17.6 | 12.2 |
| Pack-years | 31.2 (26.8) | 22.0 (23.9) | 16.5 (19.2) | 12.5 (16.7) |
| Physical activity, sports index | 2.4 (0.8) | 2.6 (0.8) | 2.6 (0.8) | 2.8 (0.8) |
| Body mass index, kg/m2 | 27.6 (4.8) | 28.1 (4.6) | 27.9 (3.9) | 27.2 (3.5) |
| Diabetes, % | 18.3 | 17.4 | 10.4 | 7.5 |
| Hypertension, % | 43.9 | 37.5 | 28.1 | 21.4 |
| Systolic blood pressure, mmHg | 126.6 (19.4) | 123.9 (17.4) | 120.3 (16.6) | 117.6 (14.3) |
| Total cholesterol, mmol/L | 5.3 (1.0) | 5.3 (0.9) | 5.3 (1.0) | 5.2 (1.0) |
| HDL cholesterol, mmol/L | 1.1 (0.4) | 1.1 (0.3) | 1.1 (0.3) | 1.1 (0.3) |
| APOE ε4+, % | 32.9 | 31.9 | 29.1 | 27.2 |
| Delayed word recall | 6.0 (1.6) | 6.3 (1.5) | 6.5 (1.5) | 6.7 (1.4) |
| Digit substitution symbols | 37.6 (13.5) | 39.7 (13.4) | 45.3 (11.8) | 48.9 (11.0) |
| Word fluency | 30.1 (13.0) | 32.0 (12.5) | 34.0 (11.9) | 36.1 (12.6) |