Table 1.

Distribution of Characteristics (Means, Proportions) by Quartiles of Plasma 25(OH)D

		Quartiles of 25(OH)D
Characteristics	Overall Mean or Proportion^a	<25th	25–49th	50–74th	75–100th
ACR=albumin-creatinine ratio; BMI=body mass index; BP=blood pressure; CV=cardiovascular; 25(OH)D=25, hydroxyvitamin D; eGFR=estimated glomerular filtration rate; MET = metabolic equivalent task.
Note: Values are weighted to produce national estimates.
^a Numbers are proportions except where indicated as means.
25(OH)D, range, ng/mL		<18	18–24.9	25–31.9	>32
25(OH)D, mean, ng/mL	29.64	13.90	21.60	28.44	41.63
Age, mean, y	43.64	45.55	45.83	44.53	40.89
Male	0.48	0.34	0.44	0.49	0.55
Race/ethnicity
White	0.77	0.48	0.68	0.82	0.91
Black	0.10	0.33	0.13	0.06	0.02
Hispanic	0.09	0.13	0.13	0.10	0.06
Other	0.03	0.06	0.05	0.03	0.01
Poverty level
<100%	0.12	0.18	0.13	0.11	0.09
100%–150%	0.10	0.12	0.11	0.08	0.09
150%–200%	0.13	0.14	0.13	0.12	0.13
200%–300%	0.23	0.21	0.23	0.23	0.23
>300%	0.43	0.35	0.40	0.46	0.46
Current smoker	0.28	0.32	0.27	0.26	0.29
Exercise, METs <3.5/mo	0.17	0.31	0.21	0.16	0.10
BMI, mean, kg/m²	26.43	28.00	27.42	26.37	25.25
Systolic BP, mean, mm Hg	121.98	124.31	123.58	122.08	119.77
Total cholesterol, mean, mg/dL	202.96	204.32	206.00	201.64	201.42
Serum albumin, mean, mg/dL	4.19	4.09	4.15	4.21	4.24
C-reactive protein, mean, mg/L	0.41	0.49	0.42	0.42	0.36
eGFR, mean, mL/min per 1.73 m²	93.72	98.77	93.32	93.42	92.24
Urinary ACR, mean	0.25	0.48	0.24	0.21	0.18
Self-rated health
Excellent	0.20	0.15	0.18	0.21	0.23
Very good	0.32	0.24	0.28	0.33	0.36
Good	0.33	0.39	0.35	0.32	0.30
Fair	0.13	0.17	0.16	0.12	0.09
Poor	0.03	0.04	0.03	0.02	0.02
Diabetes	0.10	0.17	0.12	0.10	0.07
Baseline CV morbidity	0.03	0.04	0.04	0.03	0.03
Chronic kidney disease	0.05	0.06	0.06	0.05	0.04