. Author manuscript; available in PMC: 2013 Feb 1.

Published in final edited form as: Kidney Int. 2012 Aug;82(4):445–453. doi: 10.1038/ki.2012.169

Table 1.

Descriptive statistics^* of the training and validation samples from the CKiD cohort study

	Training 2/3 random sample (n=643)	Validation 1/3 random sample (n=322)
Height, m	1.4 (1.2, 1.6)	1.4 (1.2, 1.6)
Serum creatinine, mg/dl	1.3 (1.0, 1.9)	1.4 (1.0, 2.0)
Height[m] / serum creatinine[mg/dl]	1.0 (0.8, 1.4)	1.0 (0.7, 1.3)
Nephelometric cystatin C, mg/l	1.7 (1.3, 2.3)	1.7 (1.3, 2.3)
Blood Urea Nitrogen, mg/dl	28.0 (21.0, 39.0)	28.0 (22.0, 41.0)
Male	60.5% (389)	64.3% (207)
Iohexol-based GFR, ml/min per 1.73m²	43.3 (32.6, 55.6)	42.4 (31.0, 55.6)

Median (inter-quartile range) reported for continuous variables, percentages (n) reported for categorical variables.