Table 1.

Patient characteristics

	Development set (n = 188)	Validation set (n = 132)
Age, years	64 ± 18	63 ± 16
Gender
Male	108 (57)	85 (64)
Female	80 (43)	47 (36)
Cirrhosis	19 (10)	21 (16)
End-stage renal disease	9 (5)	10 (8)
Manifestations in emergency department
Hematemesis	3 (2)	10 (8)
Red blood per nasogastric tube	20 (11)	12 (9)
'Coffee ground' emesis	25 (13)	19 (14)
Red blood per rectum	32 (17)	39 (30)
Melena	17 (9)	22 (17)
None	95 (50)	47 (36)

Values are expressed as mean ± standard deviation or number (percentage).