Table 2.
Age-standardized baseline characteristics by categories of physical activity. Nurses’ Health Study I (n=74,551)
| Physical activity, METs/week | |||||
|---|---|---|---|---|---|
| 0–4.9 | 5–9.9 | 10–19.9 | 20–29.9 | 30+ | |
| (n=30,804) | (n=12,276) | (n=13,933) | (n=7,765) | (n=9,773) | |
| Age, years* | 52.9(7.1) | 52.9(7.2) | 52.9(7.2) | 53.0(7.2) | 52.9(7.2) |
| BMI, kg/m2 | 26(5) | 25(5) | 25(4) | 25(4) | 24(4) |
| Caucasian, % | 94 | 95 | 95 | 94 | 94 |
| Diabetes, % | 4 | 4 | 3 | 3 | 3 |
| Hypertension, % | 27 | 26 | 24 | 23 | 22 |
| Gout, % | 2 | 2 | 2 | 2 | 2 |
| Thiazide use, % | 14 | 14 | 13 | 12 | 11 |
| Calcium supplement use, % | 42 | 48 | 51 | 52 | 54 |
| Postmenopausal hormone use, % | 14 | 14 | 14 | 14 | 14 |
| Caffeine, mg/day | 302(240) | 281(224) | 271(219) | 261(213) | 263(218) |
| Dietary calcium, mg/day | 699(257) | 721(245) | 735(252) | 743(249) | 749(259) |
| Total potassium, mg/day | 2,960(619) | 3,053(595) | 3,116(606) | 3,158(609) | 3,242(655) |
| Magnesium, mg/day | 287(66) | 299(66) | 308(68) | 314(71) | 320(72) |
| Total vitamin C, mg/day | 311(356) | 342(365) | 364(376) | 371(379) | 410(409) |
| Fructose, g/day | 21(9) | 22(9) | 22(9) | 22(9) | 23(9) |
| Oxalate, mg/day | 108(83) | 119(90) | 124(92) | 129(96) | 140(120) |
| Phytate, mg/day | 673(252) | 706(259) | 732(277) | 745(281) | 752(311) |
| Alcohol intake, g/day | 6(11) | 6(10) | 6(10) | 7(11) | 7(11) |
| Fluid, mL/day | 1,423(709) | 1,401(677) | 1,386(658) | 1,362(658) | 1,395(704) |
Values are means(SD) or percentages and are standardized to the age distribution of the study population. Dietary intakes are energy-adjusted except for alcohol and fluid.
*
Value is not age adjusted