Table 1.
Baseline characteristics of the NHANES study population with CKD stages 1–4
| Total N = 13,414 |
CKD stage 1 N = 1,428 (9.9%) |
CKD stage 2 N = 9,306 (75.2%) |
CKD stage 3 N = 2,471 (14.0%) |
CKD stage 4 N = 209 (1.0%) |
|
| Age in years (SD) | 59.8 (17.4) | 42.1 (16.7) | 53.7 (16.1) | 73.1 (10.3) | 74.6 (11.0) |
| Sex (%) Male Female |
6885 (51.3) 6529 (48.7) |
558 (39.1) 870 (60.9) |
5067 (54.5) 4239 (45.6) |
1164 (47.1) 1307 (52.9) |
96 (45.9) 113 (54.1) |
| Race (%) Non-Hispanic White Non-Hispanic Black Hispanic Other |
7464 (55.6) 3039 (22.7) 2487 (18.5) 424 (3.2) |
489 (34.2) 263 (18.4) 599 (42.0) 77 (5/4) |
5332 (57.3) 2103 (22.6) 1588 (17.1) 283 (3.0) |
1529 (61.9) 613 (24.8) 276 (11.2) 53 (2.1) |
114 (54.6) 60 (28.7) 24 (11.5) 11 (5.3) |
| Deaths over mean 71 months of follow-up (%) | 2093 (15.4) | 129 (9.0) | 1104 (11.9) | 747 (30.2) | 113 (54.1) |
| Systolic blood pressure in mmHg (SD) | 131.1 (21.9) | 127.3 (22.4) | 129.7 (20.7) | 137.7 (23.8) | 143.0 (29.6) |
| Diastolic blood pressure in mmHg (SD) | 69.7 (15.2) | 72.4 (14.4) | 70.9 (14.0) | 64.4 (17.7) | 61.6 (19.6) |
| Presence of diabetes (%) | 2610 (19.5) | 404 (28.3) | 1384 (14.9) | 731 (29.6) | 91 (43.5) |
| Smoking history (%) | 1992 (14.9) | 316 (22.1) | 1459 (15.7) | 201 (8.1) | 16 (7.7) |
| eGFR in mL/min/1.73 m2 (SD) | 75.0 (19.5) | 110.2 (14.7) | 77.5 (8.4) | 49.5 (7.8) | 24.4 (4.1) |
| Urine albumin-to-creatinine ratio (mg/g)* (SD) | 79.8 (481.0) | 186.4 (674.6) | 35.3 (209.0) | 127.4 (641.7) | 816.4 (2126.5) |
| BMI* (SD) | 28.8 (6.3) | 29.1 (7.5) | 28.7 (6.1) | 29.1 (6.4) | 29.5 (6.7) |
| Comorbidities – None (%) | 6330 (47.2) | 801 (56.09) | 4760 (51.2) | 750 (30.4) | 19 (9.1) |
| Comorbidities – 1 (%) | 4382 (32.7) | 446 (31.2) | 3038 (32.7) | 837 (33.9) | 61 (29.2) |
| Comorbidities – 2 (%) | 1785 (13.3) | 137 (9.6) | 1059 (11.4) | 539 (21.8) | 50 (23.9) |
| Comorbidities – 3 (%) | 618 (4.6) | 35 (2.5) | 323 (3.5) | 213 (8.6) | 47 (22.5) |
| Comorbidities – 4 (%) | 220 (1.6) | 8 (0.6) | 91 (1.0) | 99 (4.0) | 22 (10.5) |
| Comorbidities – 5 (%) | 79 (0.6) | 1 (0.1) | 35 (0.4) | 33 (1.3) | 10 (4.8) |
*
There were 347 subjects with missing data for urine albumin to creatinine ratio and 472 subjects with missing data for BMI.