Table 1.
Selected characteristics of study participants by quartiles of forced expiratory volume in 1 second (FEV1), women, ARIC Study, 1990–1992. Numbers correspond to means (standard deviation) or percentages.
| FEV1 | ||||
|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | |
| N | 1551 | 1581 | 1562 | 1545 |
| FEV1, range, L | <2.0 | 2.0–2.3 | 2.4–2.7 | >2.7 |
| mean (SD), L | 1.7 (0.3) | 2.2 (0.1) | 2.5 (0.1) | 2.9 (0.2) |
| FVC, L | 2.4 (0.4) | 2.9 (0.3) | 3.3 (0.3) | 3.8 (0.4) |
| Age, years | 59.1 (5.5) | 57.2 (5.6) | 55.8 (5.4) | 54.1 (4.8) |
| Race, % African-Americans | 40.3 | 27.7 | 21.5 | 13.4 |
| Education | ||||
| Less than high school | 32.0 | 23.3 | 16.0 | 10.8 |
| High school completed | 41.8 | 46.5 | 48.3 | 46.4 |
| College degree | 26.2 | 30.3 | 35.7 | 42.8 |
| Current smoker, % | 33.2 | 21.3 | 14.8 | 12.3 |
| Pack-years | 15.6 (20.7) | 9.9 (15.9) | 6.7 (12.1) | 5.9 (11.2) |
| Physical activity, sports index | 2.2 (0.7) | 2.3 (0.7) | 2.4 (0.7) | 2.4 (0.8) |
| Body mass index, kg/m2 | 29.1 (6.9) | 28.6 (6.1) | 27.8 (5.8) | 26.9 (5.2) |
| Diabetes, % | 20.2 | 15.7 | 10.7 | 6.6 |
| Hypertension, % | 46.2 | 36.8 | 31.3 | 20.8 |
| Systolic blood pressure, mmHg | 126.0 (20.1) | 121.4 (18.7) | 118.0 (17.4) | 115.5 (16.6) |
| Total cholesterol, mmol/L | 5.6 (1.1) | 5.6 (1.0) | 5.5 (1.0) | 5.4 (1.0) |
| HDL cholesterol, mmol/L | 1.4 (0.4) | 1.4 (0.4) | 1.4 (0.4) | 1.5 (0.4) |
| APOE ε4+, % | 32.4 | 30.7 | 30.8 | 28.3 |
| Delayed word recall | 6.5 (1.6) | 6.8 (1.4) | 7.0 (1.4) | 7.3 (1.3) |
| Digit substitution symbols | 40.6 (14.4) | 44.5 (13.8) | 49.3 (13.3) | 53.2 (12.9) |
| Word fluency | 30.8 (12.5) | 34.1 (12.1) | 34.8 (12.2) | 36.8 (11.7) |