Table 1.

OBS assignment scheme

OBS componentsAssignment schemea
1. PUFA intake0 = High (3rd tertile), 1 = Medium (2nd tertile), 2 = Low (1st tertile)
2. Serum ferritin0 = High (3rd tertile), 1 = Medium (2nd tertile), 2 = Low (1st tertile)
3. Totalb vitamin C intake0 = Low (1st tertile), 1 = Medium (2nd tertile), 2 = High (3rd tertile)
4. Plasma lycopene0 = Low (1st tertile), 1 = Medium (2nd tertile), 2 = High (3rd tertile)
5. Plasma α-carotene0 = Low (1st tertile), 1 = Medium (2nd tertile), 2 = High (3rd tertile)
6. Plasma β-carotene0 = Low (1st tertile), 1 = Medium (2nd tertile), 2 = High (3rd tertile)
7. Plasma lutein0 = Low (1st tertile), 1 = Medium (2nd tertile), 2 = High (3rd tertile)
8. Plasma β-cryptoxanthin0 = Low (1st tertile), 1 = Medium (2nd tertile), 2 = High (3rd tertile)
9. Plasma α-tocopherol0 = Low (1st tertile), 1 = Medium (2nd tertile), 2 = High (3rd tertile)
10. Selenium supplements0 = No supplement, 1 = Unknown (missing data), 2 = Supplement
11. Smoking history0 = Current smoker, 1 = Former smoker, 2 = Never smoker
12. Regular aspirin use0 = No regular use, 1 = Unknown, 2 = Regular use
13. Regular NSAID use0 = No regular use, 1 = Unknown, 2 = Regular use
14. Alcohol consumption0 = Above median, 1 = Below median, 2 = Nondrinker

Abbreviation: PUFA, polyunsaturated fatty acid.

  • aLow, intermediate, and high categories correspond to study-specific tertile values among controls.

  • bTotal intake = dietary intake + supplemental intake.