Table 3.
Age-standardized baseline characteristics by intake of total vitamin C: HPFS
| Total vitamin C | |||||
|---|---|---|---|---|---|
| <90 mg/d | 90–249 mg/d | 250–499 mg/d | 500–999 mg/d | ≥1,000 mg/d | |
| Vitamin C, mg/d | 67.0(15.9) | 164(43) | 343(69) | 716(126) | 1,530(389) |
| Age, y * | 51.5(9.1) | 53.7(9.8) | 54.4(9.9) | 55.0(9.8) | 54.3(9.5) |
| BMI, kg/m2 | 25.8(3.4) | 25.6(3.4) | 25.4(3.4) | 25.2(3.1) | 25.1(3.3) |
| Thiazide use | 8 | 9 | 9 | 9 | 9 |
| Calcium supplement use | 5 | 11 | 25 | 44 | 57 |
| Dietary calcium, mg/d | 746(325) | 798(301) | 815(292) | 813(303) | 814(314) |
| Potassium, mg/d | 2,850(550) | 3,338(588) | 3,645(718) | 3,619(787) | 3,744(834) |
| Magnesium, mg/d | 302(64) | 337(67) | 370(81) | 381(89) | 404(103) |
| Total fructose, g/d | 17.8(10.9) | 23.8(9.5) | 28.9(11.4) | 27.9(12.7) | 27.9(12.7) |
| Oxalate, mg/d | 103(75) | 138(144) | 157(139) | 152(129) | 168(160) |
| Phytate, mg/d | 812(335) | 905(358) | 973(399) | 1,009(417) | 1,068(451) |
| Animal protein, g/d | 67.6(18.0) | 68.1(17.2) | 66.7(17.7) | 67.1(18.4) | 67.9(18.8) |
| Alcohol intake, g/d* | 6.0[0–17.1] | 6.0[1.0–15.4] | 5.3[0.9–13.9] | 6.0[0.9–15.0] | 5.8[0.9–15.0] |
| Fluid volume, L/d | 1.93(0.81) | 1.92(0.77) | 1.99(0.80) | 1.99(0.81) | 1.91(0.78) |
Note: Values for categorical variables are given as percentage and those for continuous variables, as mean ± standard deviation or median [interquartile range], and are standardized to age distribution of study population except where otherwise specified. Nutrient intakes are energy-adjusted.
BMI, body mass index; HPFS, Health Professionals Follow-up Study
*
Value is not age adjusted