Table 1.
Baseline characteristics of the study population
| Characteristics | Mean (standard deviation) or % |
|---|---|
| Age, y | 62.0 (11.2) |
| Women, % | 55.9% |
| Education, % | |
| Below high school | 29.2% |
| High school and above | 70.8% |
| Smoking, % | |
| Never/former smoker | 80.3% |
| Current smoker | 19.7% |
| Alcohol intake, g/wk | 54.8 (121.3) |
| Body mass index kg/m2 | 28.8 (5.4) |
| Body surface area, m2 | 1.82 (0.2) |
| Diabetes mellitus, % | 9.1% |
| Hypertension, % | 50.3% |
| Serum creatinine, mg/dL | 0.9 (0.3) |
| Serum cystatin C, mg/L | 0.9 (0.3) |
| Mean MDRD eGFRa‡ | 76.2 (18.7) |
| Mean Cockcroft–Gault eGFRa | 82.9 (24.0) |
| Mean Mayo equation eGFRa | 93.5 (17.8) |
| Mean cystatin C equation eGFRa | 84.3 (23.6) |
| Mean combined cystatin C and creatinine equation eGFRa | 83.1 (20.1) |
Note:
a
Estimated glomerular filtration rate, mL/min per 1.73 m2.
Abbreviation: MDRD, modification of diet in renal disease.