Table 1.

Characteristics of participants by serum magnesium quintiles (ARIC 1987–1992)

Serum magnesium quintilesa (mEq/L)
Participant characteristics0.60–1.501.51–1.591.60–1.651.66–1.701.71–2.65
N2,8292,6502,0582,6492,823
Dietary magnesium intake (mg/day)b,c247 (95)253 (95)255 (95)255 (92)263 (98)
Age in yearsc,d56.9 (5.8)56.7 (5.8)56.9 (5.6)56.9 (5.6)57.2 (5.7)
Male sexb,e1,160 (41)1,147 (43)960 (47)1,298 (49)1,358 (48)
Black raceb,e1,200 (42)681 (26)440 (21)496 (19)439 (16)
Educational attainment (>high school)b,e1,986 (70)2,068 (78)1,631 (79)2,162 (82)2,280 (81)
Use of aspirin in the preceding 2 weeksd,e1,417 (50)1,316 (50)1,068 (52)1,319 (50)1,575 (52)
Current smokerd,e691 (25)584 (22)451 (22)580 (22)608 (22)
Diabetesd,e646 (23)282 (11)159 (8)191 (7)124 (4)
HRT use (females only)d,e746 (45)684 (46)497 (46)594 (44)633 (4)
Physical activity indexb,c2.3 (0.8)2.4 (0.8)2.4 (0.8)2.5 (0.8)2.5 (0.8)
Alcohol intake (grams/d)b,c6.0 (15.5)5.4 (12.4)6.5 (13.2)6.2 (12.6)6.5 (12.7)
BMI (kg/m2)c,d29.3 (6.2)28.1 (5.5)27.8 (5.1)27.5 (5.1)27.2 (4.6)
Energy intake (kcal/day)b,c1626 (734)1634 (692)1627 (656)1629 (658)1656 (697)
Dietary calcium intake (mmol/L)b,c634 (376)653 (379)661 (379)662 (364)679 (394)
Dietary fiber intake (g/day)b,c17.0 (8.3)17.4 (8.0)17.2 (8.1)17.2 (7.8)17.6 (8.6)
  • aAverage of characteristics assessed at visits 1 (1987–1989) and 2 (1990–1992).

  • bCharacteristics assessed at visit 1 (1987–1989).

  • cMean (SD).

  • dCharacteristics assessed at visit 2 (1990–1992).

  • eNumber (%).