Association between being breastfed in infancy and adult colorectal cancer risk among Japanese men and women.

The interaction term for assessment of risk heterogeneity across sex was marginally significant in rectal cancer ( p = 0.06).

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According to mixed breast and formula, and breast only, a relatively large OR was observed for women who had been fed by breast only, although the value did not reach statistical significance (OR = 1.84; 95% CI 0.82–4.13).

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