Table 1. Baseline characteristics of the study populations according to history of psoriasisa.
| HPFS (1986-2010) | NHS (1998-2010) | |||
|---|---|---|---|---|
| No psoriasis | Psoriasis | No psoriasis | Psoriasis | |
| No. of participants | 27,459 | 292 | 69,730 | 1,329 |
| Age, years, mean (SD) | 50.5(8.1) | 52.1(8.4) | 63.0(6.8) | 63.0(6.8) |
| White race, % | 96.1 | 98.0 | 96.8 | 98.1 |
| Body mass index, kg/m2, mean (SD) | 24.7(4.6) | 25.0(4.6) | 26.7(5.1) | 27.7(5.7) |
| Physical activity, metabolic equivalent hrs/wk, mean (SD) | 22.4(31.1) | 24.6(37.4) | 18.1(21.9) | 16.4(19.8) |
| Current smoking, % | 6.6 | 8.8 | 9.2 | 10.9 |
| Hypertension, % | 15.2 | 18.7 | 41.8 | 46.3 |
| Type 2 diabetes, % | 0.0 | 0.4 | 4.7 | 7.6 |
| Diuretics use, % | 5.9 | 7.4 | 10.5 | 13.9 |
| Aspirin use, % | 26.2 | 24.5 | 52.0 | 51.1 |
| Menopausal status, % | - | - | 93.0 | 93.1 |
| Postmenopausal hormones use,b % | - | - | 52.4 | 50.2 |
| Alcohol intake, g/d, mean (SD) | 10.8(14.3) | 9.8(14.5) | 5.1(8.9) | 5.3(10.2) |
| Total energy, kcal/d, mean (SD) | 1998(615) | 2035(610) | 1715(427) | 1740(430) |
| Total vitamin C, mg/d, mean (SD) | 415(451) | 436(444) | 352(312) | 344(303) |
| Coffee intake, servings/d, mean (SD) | 2.2(1.9) | 2.3(2.0) | 2.8(1.6) | 2.9(1.6) |
| Total meat intake, servings/d, mean (SD) | 1.5(0.8) | 1.5(0.8) | 1.4(0.5) | 1.5(0.5) |
| Seafood intake, servings/d, mean (SD) | 0.4(0.3) | 0.4(0.3) | 0.3(0.2) | 0.3(0.2) |
| Total dairy intake, servings/d, mean (SD) | 1.9(1.4) | 2.0(1.3) | 2.0(1.0) | 2.1(1.0) |
| Free fructose, % of energy, mean (SD) | 5.1(2.2) | 5.0(2.2) | 5.3(1.8) | 5.2(1.7) |
a
Other than No. of participants and age, all variables are standardized to the age distribution of the study population.
b
Percentages among postmenopausal women.