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Predicted asthma symptom days per two-week period associated with classroom endotoxin levels (log-transformed) stratified by IL4Rα-Q576R genotype demonstrates a gene by environment (G×E) interaction. The overall interaction p-value = 0.09; pairwise interaction p-values for Q/R vs. Q/Q = 0.115, R/R vs. Q/Q = 0.049.
