Table 1.

Baseline characteristics of the participants.

Variables	Median (IQR) or N (%)
Male	394 (59.9)
Age (yrs)	12 (8, 15)
Weight z-score	0.1 (−0.8, 1.0)
Height z-score	−0.5 (−1.3, 0.3)
BMI z-score	0.5 (−0.3, 1.4)
BMI z-score ≤ −2	15 (2.3)
BMI z-score ≥ 2	62 (9.6)
Glomerular disease	203 (30.9)
GFR (ml/min/1.73m2)	53.5 (38.9, 73.5)
Maternal education
High school	244 (37.9)
College and more	400 (62.1)
Race
Caucasian	447 (67.9)
African-American	97 (14.7)
Other	114 (17.4)
Annual Family income
Less than $36000	256 (38.9)
$36000 to $75000	182 (27.7)
More than $75000	220 (33.4)
Hypoalbuminemia	51 (7.8 )
Hyperkalemia	45 (7.0)
Hyperphosphatemia	84 (13.1)