Living on a farm, contact with farm animals and pets, and childhood acute lymphoblastic leukemia: pooled and meta-analyses from the Childhood Leukemia International Consortium.

By contrast, the association with livestock contact in the first year of life was specifically restricted to children who were reported to have had contact with pets in the first year of life (OR = 0.60, 95% CI: 0.44, 0.81; not tabulated), although the interaction was marginally statistically significant ( P int = 0.09; Table 5 ).

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