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RESULTS: Approximately 27.0% of cases were born from April through June, compared with 25.6% of controls (odds ratio, 1.07; 95% confidence interval, 1.02-1.12; P = .002). Comparisons made by sex (male vs female) and type of IBD (ulcerative colitis vs Crohn's disease) showed statistical significance only for men with Crohn's disease (odds ratio, 1.13; 95% confidence interval, 1.03-1.25; P = .009). At ages 6 months and older, cases and controls born from April through June received a significantly greater number of prescriptions for antibiotics than cases and controls born in other months.
CONCLUSIONS: Men with Crohn's disease are more likely to have been born in the months of April through June
From
http://www.ncbi.nlm.nih.gov/m/pubmed/23924874/