Table 2. Incidence of gastrointestinal bleeding in patients administered both warfarin and a statin, based on the 3 steps of identification.

	1. ICD-10 codes for location of bleeding				2. Codes for stool blood	3. Codes for control of endoscopic bleeding
	Upper	Lower	Upper/ lower	Variceal	Positive occult blood test	Upper gastrointestinal tract	Lower gastrointestinal tract
Pravastatin	2	0	1	0	0	1	0
Simvastatin	2	1	1	0	3	0	0
Atorvastatin	5	2	0	0	7	2	0
Rosuvastatin	2	2	0	0	5	2	0

ICD, International Classification of Diseases