Table 3.

Age-adjusted relative risk of colorectal cancer cross-classifying dietary calcium and calcium from supplements

Calcium from diet

Q1
Q2-Q5
Calcium from supplementsMedian intake, 337 mg (range, <412 mg)*Median intake, 655 mg (range, ≥412 mg)*
Categories 1-31.00 (reference)0.82 (0.65-1.02)
    Median intake, 130 mg (range, ≤800 mg)n = 7,861 (97 cases)n = 31,208 (335 cases)
Category 41.05 (0.62-1.77)0.54 (0.37-0.79)
    Median intake, 1,270 mg (range, >800 mg)n = 1,209 (16 cases)n = 5,076 (36 cases)
  • NOTE: P value for interaction term for calcium from diet and calcium from supplements was not significant.

  • * Based on residual method for energy adjustment of dietary calcium intake.