Table 2.

input variables.

male	rofecoxib
female	NSAIDs
Age	Anticoagulant agents
Bleeding in hospital	calcium antagonists
previous bleeding	nitroderivates
peptic ulcer	heparine
gastric surgery	corticosteroids
hypertension	antidepressant
Obstructive lung disease	syncope
kidney failure	hematemesis
dialisis	melena
ischemic hearth disease	black vomiting
cardiac dilatation	red blood vomiting
cardiac failure	sistolic blood pressure
diabetes	diastolic blood pressure
cancer	heart rate
cancer site	presence of blood in rectum
leukemia	black blood
liver cirrosis	red blood vomiting
cerebro vascular disease	nasogastric intubation
no concomitant diseases	red blood from gastric tube
aspirin	black blood from gastric tube
ticlopidine	solid material from gastric tube
clopidogrel	time from symptoms and hospital
celecoxib	hemoglobin value