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In all, 51 patients had a gastrointestinal event; the event rate was 1.1% with omeprazole and 2.9% with placebo at 180 days (hazard ratio with omeprazole, 0.34, 95% confidence interval [CI], 0.18 to 0.63; P<0.001).
 51 patients: Subject; 51: Subject.Population; gastrointestinal event: Effect; 1.1% with omeprazole and 2.9% with placebo: Treatment; omeprazole: Treatment.Drug; placebo: Treatment.Drug; 180 days: Treatment.Time_elapsed
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: adverse event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Subject.Disorder, Treatment.Route, Subject.Race, Treatment.Time_elapsed, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 51 patients: Subject; 51: Subject.Population; gastrointestinal event: Effect; 1.1% with omeprazole and 2.9% with placebo: Treatment; omeprazole: Treatment.Drug; placebo: Treatment.Drug; 180 days: Treatment.Time_elapsed