Table 1.
Demographic and clinical characteristics
| Variable |
N = 412 subjects N (%) or median (IQR) |
|---|---|
| Age, years | 15.4 (11.9, 18.6) |
| Male sex | 249 (60%) |
| Race | |
| Caucasian | 282 (68%) |
| African American | 68 (17%) |
| Other | 21 (5%) |
| More than one excluding African American | 23 (6%) |
| More than one including African American | 18 (4%) |
| Hispanic | 56 (14%) |
| Povertya | |
| Yes | 93 (23%) |
| No | 310 (75%) |
| Missing | 9 (2%) |
| Maternal education | |
| High school | 161 (39%) |
| Some college | 110 (27%) |
| College and more | 129 (31%) |
| Missing | 12 (3%) |
| Lead (mcg/dL) | 1.2 (0.8, 1.8) |
| Estimated GFR, mL/min/1.73 m2 | 39.0 (27.0, 54.3) |
| CKD Stage | |
| Stage 1 | 4 (1%) |
| Stage 2 | 64 (16%) |
| Stage 3 | 213 (52%) |
| Stage 4 | 126 (31%) |
| Stage 5 | 3 (1%) |
| Missing | 2 (0.5%) |
| CKD duration, years | 13.6 (9.9, 16.5) |
| Etiology of CKD | |
| Non-glomerular | 344 (84%) |
| Glomerular | 68 (17%) |
| Abnormal birth history (premature, small for gestational age, or low-birth weight) | 126 (31%) |
| Hypertension (SBP or DBP ≥ 95th percentile or self-reported hypertension plus antihypertensive use) | 175 (42%) |
| Proteinuria | |
| None (UPC < 0.2) | 113 (27%) |
| Significant (UPC 0.2 to < 2) | 202 (49%) |
| Nephrotic (UPC ≥ 2) | 76 (18%) |
| Missing | 21 (5%) |
| Hemoglobin, g/dL | 12.7(11.5, 13.8) |
| Anemia (hemoglobin < 5th percentile for age, sex, race) | |
| No | 237 (58%) |
| Yes | 152 (37%) |
| Missing | 23 (6%) |
a
Based on 2009 poverty guidelines, http://aspe.hhs.gov/poverty/09poverty.shtml
GFR glomerular filtration rate, CKD chronic kidney disease, UPC urine protein to creatinine ratio, mg protein/mg creatinine