Table 7

RRa estimates (95% CI) for combinations of tertiles of dietary folate and categories of dietary vitamin C intake: Netherlands Cohort Study 1986–1992

Folate tertilesVitamin C categoriesb
123
11.00c0.74 (0.57–0.96)0.81 (0.53–1.23)
20.87 (0.58–1.30)0.60 (0.46–0.78)0.67 (0.51–0.90)
30.88 (0.33–2.32)0.72 (0.52–0.98)0.56 (0.44–0.72)
  • a Adjusted for current smoking, years of smoking cigarettes, number of cigarettes per day, highest educational level, family history of lung cancer, and age.

  • b Category 1, quintile 1; Category 2, quintiles 2 and 3; Category 3, quintiles 4 and 5.

  • c Reference category.