Table 2.
Oxidative balance score assignment scheme (N = 20,680).
| OBS components | Property | Male | Female | ||||
|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 0 | 1 | 2 | ||
| Dietary OBS components | |||||||
| Dietary fiber (g/d) | A | <12.85 | 12.85–20.5 | ≥20.5 | <10.85 | 10.85–16.8 | ≥16.8 |
| β-Carotene (RE/d) | A | <103.94 | 103.94–323.61 | ≥323.61 | <102.15 | 102.15–349.94 | ≥349.94 |
| Vitamin B2 (mg/d) | A | <1.73 | 1.73–2.55 | ≥2.55 | <1.35 | 1.35–1.96 | ≥1.96 |
| Niacin (mg/d) | A | <21.42 | 21.42–31.15 | ≥31.15 | <15.58 | 15.58–22.57 | ≥22.57 |
| Vitamin B6 (mg/d) | A | <1.64 | 1.64–2.46 | ≥2.46 | <1.24 | 1.24–1.83 | ≥1.83 |
| Total folate (mcg/d) | A | <320.6 | 320.6–490.23 | ≥490.23 | <253.5 | 253.5–380.0 | ≥380.0 |
| Vitamin B12 (mcg/d) | A | <3.46 | 3.46–6.1 | ≥6.1 | <2.46 | 2.46–4.38 | ≥4.38 |
| Vitamin C (mg/d) | A | <41.7 | 41.7–102.0 | ≥102.0 | <39.5 | 39.5–91.78 | ≥91.78 |
| Vitamin E (ATE) (mg/d) | A | <5.54 | 5.54–8.90 | ≥8.90 | <4.59 | 4.59–7.51 | ≥7.51 |
| Calcium (mg/d) | A | <683.5 | 683.5–1087.5 | ≥1087.5 | <570.0 | 570.0–881.7 | ≥881.7 |
| Magnesium (mg/d) | A | <249.0 | 249.0–355.5 | ≥355.5 | <199 | 199–280 | ≥280 |
| Zinc (mg/d) | A | <9.58 | 9.58–14.21 | ≥14.21 | <7.01 | 7.01–10.22 | ≥10.22 |
| Copper (mg/d) | A | <1.03 | 1.03–1.49 | ≥1.49 | <0.84 | 0.84–1.20 | ≥1.20 |
| Selenium (mcg/d) | A | <97.6 | 97.6–141.3 | ≥141.3 | <72.0 | 72.0–103.6 | ≥103.6 |
| Total fat (g/d) | P | ≥100.30 | 66.80–100.30 | <66.80 | ≥75.04 | 50.18–75.04 | <50.18 |
| Iron (mg/d) | P | ≥18.47 | 12.50–18.47 | <12.50 | ≥14.01 | 9.67–14.01 | <9.67 |
| Lifestyle OBS components | |||||||
| Physical activity (MET-minute/week) | A | <690.73 | 690.73–3360.0 | ≥3360.0 | <520 | 520–1920 | ≥1,920 |
| Alcohol (drinks/d) | P | ≥30 | 0–30 | None | ≥15 | 0–15 | None |
| Body mass index (kg/m2) | P | ≥29.76 | 25.49–29.76 | <25.49 | ≥31.3 | 25.3–31.3 | <25.3 |
| Cotinine (ng/ml) | P | ≥2.38 | 0.03–2.38 | <0.03 | ≥0.12 | 0.019–0.12 | <0.019 |
The dietary components did not include nutrients obtained from dietary supplements or medications.
OBS, oxidative balance score; A, antioxidant; P, prooxidant; RE, retinol equivalent; ATE, alpha-tocopherol equivalent; MET, metabolic equivalent.