Table 1: Characteristics of study sample at baselinea.
| Characteristic | All participants (n = 368) | CKD (n = 105) | No CKD (n = 263) | P-value |
| Age (years) | 76.7 ± 4.3 | 77.7 ± 3.9 | 76.3 ± 4.3 | < 0.01 |
| Women (%) | 251 (68.2) | 69 (65.7) | 182 (69.2) | 0.53 |
| White (%) | 286 (77.7) | 82 (78.1) | 204 (77.6) | 1.00 |
| African American (%) | 69 (18.8) | 23 (21.99) | 46 (17.5) | 0.33 |
| Physical activity intervention (%) | 182 (49.5) | 53 (50.5) | 129 (49.1) | 0.82 |
| Current smokers (%) | 53 (14.4) | 18 (17.1) | 33 (13.3) | 0.88 |
| Body mass index (kg/m2) | 30.2 ± 5.8 | 30.7 ± 5.5 | 30.0 ± 5.9 | 0.29 |
| Diabetes mellitus (%) | 84 (22.8) | 38 (36.2) | 46 (17.5) | < 0.01 |
| Hypertension (%) | 255 (69.5) | 83 (79.1) | 172(65.7) | 0.01 |
| Cardiovascular disease (%)b | 50 (13.6) | 19 (18.1) | 31 (11.8) | 0.13 |
| Serum creatinine (mg/dL) | 0.94 ± 0.28 | 1.24 ± 0.27 | 0.82 ± 0.16 | < 0.01 |
| Estimated glomerular filtration rate (ml/min/1.73 m2) | 69.6 ± 16.8 | 49.2 ± 8.1 | 77.66 ± 11.8 | < 0.01 |
| Short physical performance battery score, points | 7.53 ± 1.43 | 7.38 ± 1.41 | 7.59 ± 1.44 | 0.20 |
aAll characteristics are mean ± SD or N (%); bCardiovascular disease: stroke, myocardial infarction, and/or congestive heart failure; CKD: Chronic Kidney Disease; SD: Standard Deviation.