Table 1. Demographics by Serum Phosphorus Concentration.

	<3.0 mg/dL	3.0-3.4 mg/dL	3.5-3.9 mg/dL	≥4.0 mg/dL
Weighted percent	15 (2,499)	35 (5,738)	35 (6,324)	14 (4,162)
Mean age (y)	46.9 ± 0.5	45.3 ± 0.6	43.7 ± 0.6	44.2 ± 0.7
Women (%)	37	49	58	62
Race (%)
White	79	78	75	74
Black	10	9	11	12
Mexican	4	5	5	6
Diabetes mellitus (%)	6	5	5	7
Hypertension (%)	28	25	22	24
Chronic kidney disease	7 (259)	7 (557)	7 (536)	10 (303)

Note: Values expressed as percent (no.) or mean ± SD, unless otherwise indicated. Serum phosphorus in mg/dL may be converted to mmol/L by multiplying by 0.3229.