Table 1 Oxidative balance score components

Non-dietary 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

Non-dietary anti-oxidants

 Physical activity (MET-min/d)

0 = low (1^st tertile), 1 = medium (2^nd tertile), and 2 = high (last tertile)

Dietary pro-oxidants

 SFA (g)

0 = high (3^rd tertile), 1 = medium (2^nd tertile), and 2 = low (1^st tertile)

 PUFA (g)

0 = high (3^rd tertile), 1 = medium (2^nd tertile), and 2 = low (1^st tertile)

 Iron (mg)

0 = high (3^rd tertile), 1 = medium (2^nd tertile), and 2 = low (1^st tertile)

Dietary anti-oxidants

 Fiber (g)

0 = low (1^st tertile), 1 = medium (2^nd tertile), and 2 = high (last tertile)

 Vitamin E (mg)

0 = low (1^st tertile), 1 = medium (2^nd tertile), and 2 = high (last tertile)

 Vitamin C (mg)

0 = low (1^st tertile), 1 = medium (2^nd tertile), and 2 = high (last tertile)

 Vitamin B₉ (µg)

0 = low (1^st tertile), 1 = medium (2^nd tertile), and 2 = high (last tertile)

 Beta-carotene (mcg)

0 = low (1^st tertile), 1 = medium (2^nd tertile), and 2 = high (last tertile)

 Zinc (mg)

0 = low (1^st tertile), 1 = medium (2^nd tertile), and 2 = high (last tertile)

 Selenium (mg)

0 = low (1^st tertile), 1 = medium (2^nd tertile), and 2 = high (last tertile)