Table 1.
Descriptive statistics of research subjects.
| Characteristic | Median | IQR |
|---|---|---|
| Age (years) | 66 | (61, 71) |
| PSA (ng/dL) | 6.00 | (4.7, 11.4) |
| TAC (mg VCE/d) | 576.8 | (312.9, 926.4) |
| GPx (nmol/min/mL) | 815 | (455.9, 1044.2) |
| GR (nmol/min/mL) | 205.8 | (151.8, 305.6) |
| GST (nmol/min/mL) | 49.7 | (32.6, 65.4) |
| SOD (units/mL)1 | 75.5 | (68.1, 80) |
| Gleason score | N | % |
| 3 + 3 | 12 | 20.3 |
| 3 + 4 | 24 | 40.7 |
| 4 + 3 | 12 | 20.3 |
| 4 + 4 | 2 | 3.4 |
| 4 + 5 | 1 | 1.7 |
| Family history2 | 12 | 25.5 |
| BMI3 | ||
| Underweight | 1 | 1.8 |
| Normal | 10 | 18.2 |
| Overweight | 19 | 34.6 |
| Obese | 21 | 38.2 |
| Morbidly obese | 4 | 7.3 |
| Race | ||
| African American | 28 | 50.9 |
| European American | 27 | 49.1 |
IQR: interquartile range; BMI: body mass index; PSA: prostate specific antigen; TAC: total antioxidant capacity; VCE/d: vitamin C equivalents per day; GPx: glutathione peroxidase; GR: glutathione reductase; GST: glutathione S-transferase; SOD: superoxide dismutase.
1One unit of SOD is the amount of enzyme needed to dismutate 50% of superoxide radicals.
2Family history defined as at least one first-degree relative diagnosed with prostate cancer.
3BMI categories defined as underweight (<18.5 kg/m2), normal (18.5 to 24.9 kg/m2), overweight (25.0 to 29.9 kg/m2), obese (30.0 to 34.9 kg/m2), and morbidly obese (>35.0 kg/m2).