Table 2.
Baseline characteristics of the NHANES study population (validation population, n = 5062)
| Variable | Mean (SD) or % of total for categorical variables | Range: minimum–maximum | 95% CI for mean | Number with missing data |
|---|---|---|---|---|
| Age, yr | 59.1 (17.0) | 18.0–84.9 | 58.6–59.6 | 0 |
| Sex | ||||
| Male | 51.1% | |||
| Female | 48.9% | |||
| Race | ||||
| Non-Hispanic white | 65.3% | |||
| Non-Hispanic black | 13.3% | |||
| Mexican American | 15.6% | |||
| Other Hispanic | 3.3% | |||
| Other | 2.6% | |||
| Systolic blood pressure, mm Hg | 130.3 (22.0) | 72.0–237.0 | 129.7–131.0 | 225 |
| Diastolic blood pressure, mm Hg | 71.5 (12.7) | 8.0–122.0 | 71.2–71.9 | 274 |
| Presence of diabetes | 13.3% | |||
| Smoking history | 15.0% | |||
| Stage of chronic kidney disease | ||||
| 2 | 84.2% | |||
| 3 | 14.0% | |||
| 4 | 1.0% | |||
| 5 | 0.7% | |||
| Hemoglobin, g/dl | 14.4 (1.5) | 5.9–19.7 | 14.3–14.4 | 1 |
| Albumin, g/dl | 4.2 (0.3) | 2.2–5.5 | 4.2–4.3 | 0 |
| Blood urea nitrogen, mg/dl | 16.1 (7.3) | 2.0–122.0 | 15.9–16.3 | 0 |
| Creatinine, mg/dl | 1.08 (0.7) | 0.7–13.7 | 1.06–1.1 | 0 |
| Calcium, total, mg/dl | 9.5 (0.4) | 6.7–12.5 | 9.49–9.51 | 0 |
| Phosphorus, mg/dl | 3.7 (0.6) | 1.8–8.1 | 3.69–3.72 | 0 |
| eGFR, ml/min per 1.73 m2 | 73.8 (14.8) | 3.5–91.0 | 73.4–74.2 | 0 |
| Urine albumin-to-creatinine ratio, mg/g | 80.1 (548.8) | 0.15–15637.7 | 64.8–95.4 | 111 |
| Prevalence of proteinuria and microalbuminuria (defined by urine albumin-to-creatinine ratio) | 3.5% >300 mg/g 15.9% >30 mg/g |
|||
| Number of comorbidities | 1.77 (1.52) | 0 - 5 | 1.73 - 1.81 | 0 |
| 2-yr Survival | 96.8% |
eGFR, estimated glomerular filtration rate.