Table 2.
Age-standardized baseline characteristics by intake of total vitamin C: NHS II
| Total Vitamin C | |||||
|---|---|---|---|---|---|
| <90 mg/d | 90–249 mg/d | 250–499 mg/d | 500–999 mg/d | ≥1000 mg/d | |
| Vitamin C, mg/d | 68.5(15.1) | 154(43) | 333(67) | 699(136) | 1,492(460) |
| Age, y * | 36.4(4.6) | 36.5(4.7) | 36.4(4.7) | 37.3(4.6) | 37.8(4.5) |
| BMI, kg/m2 | 25.1(5.8) | 24.6(5.2) | 24.3(5.1) | 23.9(4.8) | 23.9(5.1) |
| Thiazide use | 2 | 2 | 2 | 2 | 2 |
| Calcium supplements use | 11 | 30 | 54 | 59 | 67 |
| Dietary calcium, mg/d | 815(313) | 895(300) | 911(303) | 910(312) | 909(311) |
| Potassium, mg/d | 2,538(456) | 2,963(477) | 3,162(583) | 3,091(591) | 3,137(620) |
| Magnesium, mg/d | 268(54) | 314(65) | 344(80) | 352(89) | 377(110) |
| Total fructose, g/d | 19.1(13.5) | 22.6(9.6) | 26.7(11.1) | 24.9(10.9) | 25.4(11.6) |
| Oxalate, mg/d | 98.1(72.0) | 134(108) | 158(139) | 158(136) | 180(184) |
| Phytate, mg/d | 725(217) | 782(232) | 813(252) | 825(268) | 870(293) |
| Animal protein, g/d | 64.1(16.7) | 64.8(16.0) | 62.2(17.3) | 63.0(17.6) | 61.7(19.4) |
| Alcohol intake, g/d* | 0.9 [0–3.1] | 0.9 [0–3.5] | 0.9 [0–3.3] | 1.0 [0–4.0] | 1.0 [0–3.9] |
| Fluid volume, L/d | 1.97(0.80) | 2.13(0.81) | 2.21(0.86) | 2.19(0.88) | 2.11(0.85) |
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 populati except where otherwise specified. Nutrient intakes are energy-adjusted.
BMI, body mass index; NHS, Nurses’ Health Study
*
Value is not age adjusted;