Phase 1 Mean or Percent	Phase 2 Mean or Percent
Age (y)	37.7	38.0
Gender (% male)	49.3	49.2
Race/ethnicity (%)
Non-Hispanic white	75.9	73.2
Non-Hispanic black	11.0	11.4
Mexican-American	5.7	6.1
Other	7.5	9.4
Poverty-income ratio	3.0	3.3
Highest grade completed	12.7	12.8
Self-reported health status (%)
Excellent	23.2	21.4
Very good	32.6	33.5
Good	31.9	33.4
Fair	10.6	10.2
Poor	1.7	1.4
eGFR (mL/min)	117.8	117.0
Chronic kidney disease (%)
Stage 1/2	6.6	6.1
Stage 3A	0.1	0.2
Stage 3B-5	0.1	0.1
Diabetes (%)	6.0	7.2
Cancer (%)	2.0	2.5
COPD (%)	6.2	5.9
Liver disease (%)	6.5	11.0
Arthritis (%)	10.9	11.3
25 hydroxy vitamin D concentration, serum (ng/mL)	29.8	30.3
Hemoglobin (g/dL)	14.0	14.2
Bicarbonate, serum (mmol/L)	28.9	27.0
C reactive protein, serum (units)	0.4	0.4
Hypertensiona (%)	18.0	17.8
Overt cardiovascular diseaseb (%)	6.8	6.7