Table 3 Odds ratios (OR) and 95 % confidence intervals (CI) for the association of dietary calcium intake and colorectal cancer sub-sites

Men

N = 1872

N = 113

N = 178

N = 320

Q1 (<335)

468

26

1.00

1.00

60

1.00

1.00

109

1.00

1.00

Q2 (335 - < 432)

468

43

1.63(0.99–2.70)

1.40(0.83–2.37)

63

1.04(0.71–1.51)

0.90(0.60–1.34)

112

1.02(0.76–1.36)

0.85(0.61–1.17)

Q3 (432 - < 567)

468

28

1.04(0.60–1.80)

0.81(0.45–1.45)

41

0.66(0.43–1.00)

0.51(0.33–0.81)

71

0.63(0.45–0.87)

0.47(0.32–0.67)

Q4 (≥567)

468

16

0.58(0.31–1.10)

0.35(0.17–0.74)

14

0.22(0.12–0.40)

0.13(0.07–0.26)^c

28

0.25(0.16–0.38)

0.13(0.08–0.23)^c

P-value for trend^b

0.021

<0.001

<0.001

<0.001

<0.001

<0.001

Women

N = 894

N = 53

N = 113

N = 124

Q1 (<380)

224

26

1.00

1.00

43

1.00

1.00

51

1.00

1.00

Q2 (380 - < 519)

223

18

0.70(0.37–1.32)

0.75(0.39–1.46)

48

1.12(0.72–1.76)

1.11(0.68–1.81)

43

0.85(0.54–1.33)

0.93(0.58–1.52)

Q3 (519 - < 663)

223

6

0.23(0.09–0.57)

0.27(0.11–0.72)

15

0.35(0.19–0.65)

0.35(0.18–0.68)

22

0.43(0.25–0.74)

0.55(0.31–0.99)

Q4 (≥663)

224

3

0.11(0.03–0.38)

0.13(0.03–0.48)

7

0.16(0.07–0.37)

0.12(0.05–0.32)

8

0.16(0.07–0.34)

0.20(0.09–0.47)

P-value for trend

<0.001

0.001

<0.001

<0.001

<0.001

<0.001