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| OBS components | Assignment scheme |
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| Nondietary pro-oxidants |
| Obesity | 0 = BMI ≥ 30 kg/m2 AND WC ≥ 1.02 m in males or ≥0.88 m in females 1 = BMI ≥ 30 kg/m2 OR WC ≥ 1.02 m in males or ≥0.88 m in females 2 = BMI < 30 kg/m2 AND WC < 1.02 m in males or <0.88 m in females |
| Smoking | 0 = current, 1 = former, and 2 = never |
| Nondietary antioxidants |
| Physical activity (MET-min/d) | 0 = low (1st tertile), 1 = medium (2nd tertile), and 2 = high (3rd tertile) |
| Dietary pro-oxidants |
| SFAs (g) | 0 = high (3rd tertile), 1 = medium (2nd tertile), and 2 = low (1st tertile) |
| PUFAs (g) | 0 = high (3rd tertile), 1 = medium (2nd tertile), and 2 = low (1st tertile) |
| Iron (mg) | 0 = high (3rd tertile), 1 = medium (2nd tertile), and 2 = low (1st tertile) |
| Dietary antioxidants |
| Vitamin E (mg) | 0 = low (1st tertile), 1 = medium (2nd tertile), and 2 = high (3rd tertile) |
| Vitamin C (mg) | 0 = low (1st tertile), 1 = medium (2nd tertile), and 2 = high (3rd tertile) |
| Provitamin A carotenoids (µg) | 0 = low (1st tertile), 1 = medium (2nd tertile), and 2 = high (3rd tertile) |
| Lutein/Zeaxanthin (µg) | 0 = low (1st tertile), 1 = medium (2nd tertile), and 2 = high (3rd tertile) |
| Lycopene (µg) | 0 = low (1st tertile), 1 = medium (2nd tertile), and 2 = high (3rd tertile) |
| Selenium (µg) | 0 = low (1st tertile), 1 = medium (2nd tertile), and 2 = high (3rd tertile) |
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