Table 3

RR of prostate cancer according to toenail selenium levels and smoking status, NLCS 1986–1992

Smoking statusNo. of casesQuintile of toenail selenium (boundaries in μg/g)P
1 (≤0.467)2 (≤0.514)3 (≤0.560)4 (≤0.616)5 (>0.616)
Nevera721.00b2.28 (0.80–6.47)0.64 (0.23–1.76)0.33 (0.09–1.18)1.19 (0.48–2.92)0.412
Exc3001.00b0.87 (0.51–1.49)0.53 (0.31–0.92)0.79 (0.45–1.37)0.46 (0.27–0.79)0.003
Currentc1681.00b0.88 (0.51–1.52)0.95 (0.51–1.74)0.53 (0.25–1.14)0.97 (0.42–2.22)0.383
  • a Adjusted for age (years), family history of prostate cancer (no/yes), level of education (low, medium, high).

  • b Reference category.

  • c Additionally adjusted for number of cigarettes/day, years of cigarette smoking.