Table 1.
Baseline Characteristics by Serum Magnesium Quintile, Atherosclerosis Risk in Communities, 1987 to 1989
| Serum Magnesium (mEq/L)
|
|||||
|---|---|---|---|---|---|
| <1.55 (n=3118) | 1.55–1.60 (n=2620) | ≥1.60–1.65 (n=3100) | ≥1.65–1.75 (n=2739) | ≥1.75 (n=2713) | |
| Magnesium median, mEq/L | 1.45 | 1.55 | 1.65 | 1.70 | 1.80 |
| Age, y | 54.2 (5.9) | 53.9 (5.8) | 54.1 (5.7) | 54.2 (5.7) | 54.5 (5.7) |
| Females, % | 59.6 | 57.8 | 54.0 | 52.5 | 52.6 |
| African Americans, % | 41.0 | 23.3 | 22.5 | 18.3 | 16.0 |
| Body mass index, kg/m2 | 28.9 (6.2) | 27.5 (5.2) | 27.4 (5.1) | 27.2 (5.0) | 26.8 (4.7) |
| Low density lipoprotein cholesterol, mg/dL | 133.5 (39.7) | 136.6 (38.8) | 139.0 (39.5) | 139.1 (37.9) | 140.9 (39.2) |
| High density lipoprotein cholesterol, mg/dL | 52.1 (18.0) | 52.3 (17.1) | 51.5 (16.4) | 51.9 (16.7) | 52.0 (16.6) |
| Serum potassium, mmol/L | 4.2 (0.4) | 4.3 (0.3) | 4.3 (0.4) | 4.4 (0.4) | 4.4 (0.4) |
| Serum creatinine, mg/dL | 1.1 (0.3) | 1.1 (0.2) | 1.1 (0.2) | 1.1 (0.3) | 1.2 (0.7) |
| Current smoker, % | 27.8 | 24.5 | 26.3 | 24.3 | 25.0 |
| Current drinker, % | 49.2 | 57.0 | 57.2 | 61.4 | 60.5 |
| High school degree, % | 38.6 | 43.2 | 43.2 | 42.5 | 40.0 |
| Diabetes, % | 20.3 | 9.4 | 8.6 | 6.2 | 4.8 |
| Systolic BP*, mmHg | 125.2 (20.3) | 120.2 (17.6) | 120.3 (18.5) | 119.2 (18.2) | 119.0 (17.6) |
| Use of antihypertensive medications, % | 43.0 | 28.0 | 27.4 | 24.3 | 30.0 |
| Previous myocardial infarction, % | 4.9 | 3.4 | 3.5 | 3.8 | 3.6 |
| Previous heart failure, % | 6.6 | 4.1 | 3.9 | 3.2 | 3.2 |
| Previous stroke, % | 2.0 | 1.7 | 1.7 | 2.1 | 1.2 |
| Dietary magnesium, mg/day | 247.1 (87.2) | 252.9 (87.1) | 253.4 (85.7) | 255.9 (88.3) | 257.6 (87.3) |
| Dietary potassium, mg/day | 2596.7 (929.8) | 2646.7 (885.0) | 2641.0 (879.9) | 2665.9 (896.7) | 2687.8 (892.5) |
| Dietary calcium, mg/day | 641.3 (343.8) | 660.9 (342.0) | 657.3 (332.0) | 669.2 (340.4) | 663.7 (340.2) |
| Total energy intake, kcal/day | 1614.1 (573.7) | 1615.4 (550.4) | 1619.6 (547.2) | 1616.5 (557.8) | 1626.7 (553.4) |
*
BP indicates blood pressure. Values are mean (SD) when appropriate.