Table 1.

Participant Characteristics in the Development and Validation Cohorts^a

Characteristic	Development		Validation
	No.	Mean±SD	No.	Mean±SD
Age, y	50	54.2±15.2	83	59.1±12.1
Body mass index, kg/m2	49	28.1±5.4	78	27.2±5.2
Muscle mass	26	116.1±20.8	79	116.4±25.7
Serum creatinine, mg/dL	41	1.10±0.37	78	1.22±0.63
Male, %		50.0		59.0
Race/ethnicity, %
White		60.0		89.2
Black		40.0		10.8
Hypertensive, %		74.0		86.7

Abbreviation: SD, standard deviation. ^aThe development cohort included complete collectors only; the validation cohort included both complete and incomplete collectors.