Table 1.
Baseline Characteristics* Among Women in the Nurses' Health Study by Quintile (Q) of Magnesium Intake
| Magnesium Intake | |||||
|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | Q5 | |
| Range of magnesium, mg/day | <246 | 246 to 276 | 277 to 305 | 306 to 342 | >342 |
| n | 21 867 | 15 988 | 14 955 | 15 279 | 18 234 |
| Age, y | 45 (7)* | 46 (7) | 47 (7) | 47 (7) | 48 (7) |
| Current smoker, % | 27 | 28 | 29 | 30 | 31 |
| BMI, kg/m2 | 24.7 (4.9) | 24.4 (4.6) | 24.2 (4.3) | 24.2 (4.2) | 24.2 (4.2) |
| Physical activity, h/week | 3.5 (2.8) | 3.7 (2.9) | 3.9 (2.9) | 4.1 (2.9) | 4.4 (2.9) |
| Current use of hormone therapy, % | 8 | 8 | 8 | 8 | 8 |
| Multivitamin use, % | 29 | 32 | 35 | 36 | 39 |
| Aspirin use, % | 14 | 14 | 14 | 15 | 15 |
| Nutrients | |||||
| Potassium, mg/day | 2123 (325) | 2535 (294) | 2769 (327) | 3007 (366) | 3466 (523) |
| Vitamin D, IU/day | 267 (248) | 304 (262) | 332 (280) | 353 (292) | 399 (318) |
| Trans fat, g/day | 4.5 (1.4) | 4.2 (1.2) | 4.0 (1.2) | 3.9 (1.3) | 3.4 (1.3) |
| Polyunsaturated:saturated fat | 0.33 (0.12) | 0.34 (0.12) | 0.34 (0.12) | 0.35 (0.13) | 0.38 (0.16) |
| Cereal fiber, g/day | 2.1 (1.3) | 2.4 (1.4) | 2.5 (1.5) | 2.6 (1.6) | 2.8 (1.7) |
| Alcohol, g/day | 5.8 (10.8) | 6.2 (10.2) | 6.6 (10.2) | 6.8 (10.7) | 6.9 (10.8) |
| History of comorbidities, % | |||||
| Hypertension | 17 | 16 | 15 | 15 | 15 |
| Diabetes | 2 | 2 | 2 | 2 | 2 |
| High cholesterol | 5 | 5 | 5 | 5 | 6 |
BMI indicates body mass index; SD, standard deviation.
*
All nutrients except alcohol were energy adjusted.
*
Mean (SD).