Table 2

ORa and 95% CIs for the association of B vitamin intake with the risk for cervical SILs

NutrientQuartile of intakebP for trendd
1 (low)c234 (high)
OROR95% CIOR95% CIOR95% CI
Folate11.00.4–2.20.60.3–1.40.30.1–0.70.002
Vitamin B610.60.3–1.40.50.2–1.20.40.2–0.90.04
Vitamin B1210.80.3–1.70.90.4–1.90.30.2–0.80.02
Thiamin10.50.2–1.20.30.1–0.80.50.2–1.10.14
Methionine10.80.4–1.90.80.3–1.80.60.3–1.30.20
Riboflavin10.50.2–1.10.40.2–0.90.40.2–1.00.08
Niacin11.00.4–2.30.50.2–1.10.60.3–1.40.11
  • a After adjustment by unconditional multiple logistic regression for age, ethnicity, tobacco smoking (ever versus never), alcohol drinking (ever versus never), number of sexual partners before age 20 (continuous), and HPV detection by PCR dot-blot hybridization (yes versus no).

  • b The quartile cutpoints for daily nutrient intake were as follows: folate, 220.7, 305.5, 422.6 μg; vitamin B6, 1.65, 2.66, 4.29 mg; vitamin B12, 3.68, 6.83, 11.39 μg; thiamin, 1.33, 2.06, 3.50 mg; methionine, 1.13, 1.54, 2.21 mg; riboflavin, 1.55, 2.47, 4.13 mg; niacin, 17.49, 27.07, 41.26 mg.

  • c Reference category for all models.

  • d Based on the likelihood ratio test comparing models with and without a trend variable that was assigned the median value for the quartiles.