Table 5

Mean and risks of prostate cancer by quartile of control selenium (μg/dl) distributionsa

OverallBaseline smoking statusExposure populationTreatment arm
Former/NeverCurrentAsbestosHeavy smokerPlaceboActive
Mean (SD)
 Case11.48 (1.96)11.59 (1.85)11.36 (2.09)11.22 (1.91)11.65 (1.99)11.30 (1.87)11.69 (2.05)
 Control11.43 (2.04)11.67 (2.14)11.15 (1.89)11.01 (2.13)11.70 (1.92)11.47 (2.08)11.38 (2.00)
ORsb (95% CI)
 Q11.001.001.001.001.001.001.00
 Q20.85 (0.53–1.35)1.03 (0.53–1.99)0.68 (0.35–1.33)0.86 (0.42–1.73)0.82 (0.44–1.53)0.82 (0.45–1.48)0.89 (0.43–1.83)
 Q31.08 (0.69–1.71)1.33 (0.70–2.52)0.85 (0.43–1.66)1.11 (0.55–2.25)1.03 (0.56–1.88)0.88 (0.46–1.66)1.40 (0.74–2.68)
 Q41.02 (0.65–1.60)0.82 (0.43–1.55)1.38 (0.73–2.59)1.26 (0.65–2.46)0.88 (0.48–1.61)0.75 (0.41–1.36)1.52 (0.78–2.79)
P (trend)0.690.650.290.420.860.400.12
  • a Quartiles of serum selenium (μg/dl) distribution: Q2 (5.07–10.12); Q2 (10.13–11.25); Q3 (11.26–12.59); and Q4 (12.60–21.96).

  • b OR from conditional logistic regression model stratified on year of randomization, age at randomization within 5-year intervals, smoking status at randomization, intervention arm, exposure population, and blood draw visit.