TABLE 1.
Oxidative Balance Score assignment scheme.
| OBS components | Property | Scoring assignment | ||
| 0 | 1 | 2 | ||
| Dietary components | ||||
| Dietary fiber (g/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Carotene (RE/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Riboflavin (mg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Niacin (mg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Vitamin B6 (mg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Total folate (mcg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Vitamin B12 (mcg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Vitamin C (mg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Vitamin E (ATE) (mg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Calcium (mg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Magnesium (mg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Zinc (mg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Copper (mg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Selenium (mcg/d) | Antioxidant | Tertile 1 | Tertile 2 | Tertile 3 |
| Total fat (g/d) | Prooxidant | Tertile 3 | Tertile 2 | Tertile 1 |
| Iron (mg/d) | Prooxidant | Tertile 3 | Tertile 2 | Tertile 1 |
| Lifestyle components | ||||
| Physical activity (MET-minute/week) | Antioxidant | <400 | 400–1,000 | >1,000 |
| Alcohol (g/d) | Prooxidant | >30 | 0–30 | None |
| Body mass index (kg/m2) | Prooxidant | >30 | 25–30 | <25 |
| Cotinine (ng/mL) | Prooxidant | >0.038 | 0.038–1.13 | <1.13 |
OBS, Oxidative Balance Score; RE, retinol equivalent; ATE, alpha-tocopherol equivalent; MET, metabolic equivalent.