Table 2. Age-adjusted* baseline† characteristics by quintile of baseline serum thyroxine (T4).
| Quintile of serum thyroxine (T4) (µg/dL) | |||||
| Q1<6.5 | Q2 6.5 - <7.4 | Q3 7.4 - <8.3 | Q4 8.3 - <9.2 | Q5≥9.2 | |
| Age | 56.4 | 56.8 | 57.4 | 57.6 | 58.4 |
| Height (cm) | 174 | 174 | 173 | 174 | 174 |
| Weight (kg) | 79.8 | 78.9 | 79.2 | 79.5 | 78.8 |
| BMI (kg/m2) | 26.5 | 26.1 | 26.3 | 26.0 | 26.0 |
| Serum cholesterol (mmol/L) | 6.0 | 6.3 | 6.3 | 6.3 | 6.4 |
| Serum α-tocopherol (mg/L) | 11.1 | 12.1 | 12.2 | 12.0 | 12.4 |
| Serum β-carotene (µg/L) | 214 | 219 | 218 | 225 | 236 |
| Serum retinol (µg/L) | 606 | 608 | 586 | 589 | 580 |
| Cigarettes per day | 19.4 | 20.1 | 20.4 | 18.9 | 19.3 |
| Years of smoking | 34.1 | 35.1 | 36.0 | 35.1 | 36.1 |
| Family history of prostate cancer | |||||
| % | 6.4 | 5.7 | 5.0 | 4.2 | 5.7 |
| Physically active | |||||
| % | 20.3 | 21.0 | 21.1 | 22.0 | 25.0 |
| >Elementary school education | |||||
| % | 21.3 | 25.5 | 27.3 | 28.8 | 26.2 |
| Married | |||||
| % | 73.3 | 82.4 | 80.9 | 81.9 | 80.2 |
| Urban residence | |||||
| % | 63.4 | 59.5 | 61.4 | 62.0 | 57.6 |
| Dietary intake per day | |||||
| Total energy (kcal) | 2,705 | 2,663 | 2,710 | 2,730 | 2,693 |
| Total fat (g) | 101 | 99 | 102 | 104 | 102 |
| Vitamin A (µg) | 1,441 | 1,538 | 1,509 | 1,566 | 1,413 |
| Vitamin D (µg) | 5.2 | 5.1 | 5.1 | 5.3 | 5.4 |
| Calcium (mg) | 1,419 | 1,338 | 1,434 | 1,428 | 1,398 |
| Fruit (g) | 220 | 206 | 212 | 219 | 223 |
| Vegetables (g) | 293 | 299 | 303 | 294 | 290 |
| Red meat (g) | 66.1 | 73.3 | 74.4 | 66.1 | 68.3 |
| Alcohol (ethanol, g) | 20.5 | 18.6 | 15.6 | 15.2 | 11.6 |
| Supplement use | |||||
| Vitamin A | |||||
| % | 6.1 | 15.6 | 14.2 | 12.1 | 13.6 |
| Vitamin D | |||||
| % | 4.1 | 9.2 | 7.1 | 8.7 | 7.3 |
| Calcium | |||||
| % | 7.9 | 15.1 | 13.8 | 10.8 | 10.8 |
*
- Directly standardized to the age distribution of the entire cohort. Values are means unless otherwise indicated.
†
- All characteristics are from the baseline questionnaire except family history which was collected during follow-up and is available for 889 men in this case control set. Baseline dietary data were available for 1,117 men, and 246 men claimed supplement use at baseline.