Question: Is this describing a (1) directly correlative relationship, (2) conditionally causative relationship, (3) causative relationship, or (0) no relationship.

Based on the findings of this analysis, patients requiring preoperative angioembolization and having a BMI >30 have a significant increase in their risk of postoperative infection, particularly if associated with leukocytosis.
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This is a conditionally causative relationship
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