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Table 3 Association between dietary cadmium intake and total prostate cancer by different baseline characteristics

From: Dietary cadmium intake and risk of prostate cancer: a Danish prospective cohort study

Stratification factors N cases Crude model p a Adjusted modelb p a
   IRR (95% CI)   IRR (95% CI)  
Education      
Low (<8y) 540 0.96 (0.80-1.15)   0.95 (0.79-1.14)  
Medium (8-10y) 633 1.01 (0.85-1.20) 0.88 1.00 (0.84-1.19) 0.90
High (>10y) 394 1.03 (0.84-1.26)   1.01 (0.82-1.24)  
Smoking      
Never 428 0.99 (0.81-1.21)   0.97 (0.79-1.18)  
Former 580 1.15 (0.97-1.37) 0.08 1.13 (0.95-1.35) 0.09
Current 561 0.87 (0.72-1.04)   0.86 (0.71-1.03)  
BMI      
<25 1000 0.93 (0.78-1.11) 0.33 0.92 (0.77-1.09) 0.29
≥25 567 1.04 (0.91-1.19)   1.03 (0.90-1.18)  
Total zinc intake      
< median 798 1.04 (0.86-1.24) 0.89 1.00 (0.84-1.21) 0.99
≥ median 769 1.02 (0.88-1.18)   1.00 (0.86-1.16)  
Total iron intake      
< median 798 1.08 (0.89-1.32) 0.59 1.05 (0.86-1.29) 0.67
≥ median 769 1.01 (0.87-1.17)   1.00 (0.86-1.16)  
  1. Abbreviations:IRR incidence rate ratio, CI confidence interval, BMI body mass index.
  2. aP values for interaction.
  3. bAdjusted for educational level (<8 y; 8-10y; >10y), smoking status (never; former; current), BMI (continuous), waist-to-hip ratio (continuous) and physical activity (MET score, continuous). BMI (continuous) was not including in the stratification analyses on BMI.
  4. The stratification factors are education, smoking, BMI, zinc intake and iron intake. Incidence rate ratios are per 10 μg increment day−1.