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Table 2 Selenium dietary intake and odds ratios for colorectal cancer (overall, and by strata of dietary calcium intake)

From: Calcium intake may explain the reduction of colorectal cancer odds by dietary selenium - a case-control study in Poland

  Model 1 Model 2 Model 3
OR 95% CI p-value OR 95% CI p-value OR 95% CI p-value
Dietary selenium intake (continuous)
 for and each increase by 10 μg/day 0.934 0.889–0.980 .006 0.892 0.839–0.948 <.001 0.918 0.843–0.999 0.048
Dietary selenium intake (categorized, reference group < 60 μg/day)
 60 to < 80 μg/day 0.814 0.619–1.070 .140 0.699 0.516–0.947 .021 0.717 0.513–1.002 .051
  ≥ 80 μg/day 0.462 0.318–0.672 <.001 0.396 0.258–0.608 <.001 0.419 0.247–0.712 .001
  p-value for trend = .005 p-value for trend < .001 p-value for trend = .001
Dietary calcium < 1000 mg/day
 Dietary selenium intake (continuous)
  for and each increase by 10 μg/day 0.997 0.930–1.069 .935 0.927 0.852–1.010 .082 0.874 0.779–0.980 .021
 Dietary selenium intake (categorized, reference group < 60 μg/day)
  60 to < 80 μg/day 0.809 0.585–1.121 .203 0.655 0.455–0.941 .022 0.562 0.378–0.835 .004
   ≥ 80 μg/day 0.574 0.326–1.011 .055 0.457 0.241–0.868 .017 0.332 0.162–0.680 .003
  p-value for trend = .066 p-value for trend = .002 p-value for trend < .001
Dietary calcium ≥1000 mg/day
 Dietary selenium intake (continuous)
  for and each increase by 10 μg/day 0.894 0.806–0.992 .034 0.864 0.764–0.977 .020 0.955 0.851–1.072 .437
 Dietary selenium intake (categorized, reference group < 60 μg/day)
  60 to < 80 μg/day 1.039 0.555–1.944 .905 0.844 0.424–1.679 .629 1.008 0.479–2.119 .984
   ≥ 80 μg/day 0.521 0.271–1.000 .050 0.475 0.230–0.980 .044 0.921 0.364–2.327 .862
  p-value for trend = .598 p-value for trend = .045 p-value for trend = .875
  1. Model 1 –univariable logistic regression
  2. Model 2 –adjusted for age [years], sex, BMI [kg/m2], pure alcohol consumption [g/week], average adult lifetime leisure-time physical activity [METs-h/week], smoking (non-smoker, past smoker, current smoker)
  3. Model 3 –adjusted for covariates used in Model 2 and additionally fish consumption [yes/no], total dietary fibre [g/day], vitamin C [mg/day] and vitamin E [mg/day], taking mineral supplements [yes/no], and dietary calcium [mg/day]