Table 2 Odds ratios (OR) and 95 % confidence intervals (CI) for the association of dietary calcium intake and colorectal cancer risk

Calcium intake (mg/day)

Calcium intake (mg/day)

Q1 (<335)

468/202

1.00

1.00

Q1 (<380)

224/125

1.00

1.00

Q2 (335 - < 432)

468/222

1.09(0.86–1.37)

0.92(0.71–1.19)

Q2 (380 - < 519)

223/111

0.89(0.65–1.23)

0.93(0.65–1.34)

Q3 (432 - < 567)

468/141

0.68(0.52–0.87)

0.51(0.38–0.68)

Q3 (519 - < 663)

223/43

0.34(0.23–0.51)

0.39(0.25–0.61)

Q4 (≥567)

468/59

0.28(0.20–0.38)

0.16(0.11–0.24)

Q4 (≥663)

224/19

0.15(0.09–0.25)

0.16(0.09–0.29)

P-value for trend^b

<0.001

<0.001

P-value for trend

<0.001

<0.001

Dairy food calcium (mg/day)

Dairy food calcium (mg/day)

Q1 (<11)

468/228

1.00

1.00

Q1 (<20)

223/109

1.00

1.00

Q2 (11 - < 47)

468/222

0.98(0.78–1.23)

1.02(0.80–1.30)

Q2 (20 - < 78)

224/102

0.93(0.67–1.29)

1.01(0.70–1.47)

Q3 (47 - < 146)

468/125

0.55(0.43–0.71)

0.65(0.49–0.85)

Q3 (78 - < 225)

224/64

0.59(0.41–0.84)

0.67(0.45–1.01)

Q4 (≥146)

468/49

0.21(0.15–0.29)

0.28(0.19–0.40)

Q4 (≥225)

223/23

0.21(0.13–0.34)

0.20(0.12–0.35)

P-value for trend

<.001

<.001

P-value for trend

<0.001

<0.001

Non-Dairy food calcium (mg/day)

Non-Dairy food calcium (mg/day)

Q1 (<279)

468/168

1.00

1.00

Q1 (<302)

224/111

1.00

1.00

Q2 (279 - < 360)

468/230

1.33(1.04–1.68)

1.07(0.82–1.40)

Q2 (302 - < 397)

223/109

0.98(0.71–1.35)

0.89(0.61–1.29)

Q3 (360 - < 470)

468/159

0.91(0.70–1.17)

0.59(0.44–0.80)

Q3 (397 - < 522)

223/58

0.52(0.36–0.75)

0.53(0.35–0.82)

Q4 (≥470)

468/66

0.37(0.27–0.50)

0.16(0.11–0.25)

Q4 (≥522)

224/20

0.18(0.11–0.30)

0.15(0.08–0.27)

P-value for trend

<0.001

<0.001

P-value for trend

<0.001

<0.001