Table 2.

Dietary calcium and magnesium intake among US adults (≥20 years) in NHANES 1999–2004.

Age (years)	RDAs for calcium (mg/day)	Calcium intake (mg/day)	P-value
20–50a	1,000	643.86 (402.73)	<0.001
51–85a	1,200	579.28 (345.46)	<0.001
20–50b	1,000	852.50 (527.06)	<0.001
51–85b	1,200	675.49 (403.29)	<0.001
Age (years)	RDAs for magnesium (mg/day)	Magnesium intake (mg/day)	P-value
20–30a	310	216.36 (101.20)	<0.001
31–85a	320	218.03 (105.11)	<0.001
20–30b	400	300.72 (153.44)	<0.001
31–85b	420	289.41 (156.73)	<0.001

^aFemale; ^bMale.