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You look back at the clinical notes of 100 patients at your practice who have vitamin B12 deficiency and 100 patients who have adequate levels of vitamin B12 to see whether having Crohn’s disease involving the ileum affected the outcome. 22 of the 100 patients with vitamin B12 deficiency also had a diagnosis of Crohn’s disease. Of the 100 patients with adequate vitamin B12 levels, 10 had Crohn’s disease involving the ileum.

What is the odds ratio of having Crohn’s disease? The final answer should be rounded to one decimal place.

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