a significant trendP = 0.0002
[22] demonstrated that there was a significant trend for increased folate intake to be associated with a lower risk of lung cancer in men (P = 0.0002), and the multivariate RR for the participants with tertile 3 folate intake was 0.70 (95% CI, 0.55–0.89) when compared to those with tertile 1 folate intake.