Uncertain Associations of Major Bleeding and Concurrent Use of Antiplatelet Agents and Chinese Medications: A Nested Case-Crossover Study

Table 1

The period prevalence and incidence of major bleeding among antiplatelet users.

	Period prevalence		Incidence
	Patient number	%^a	Patient number	%^a	Per 1000 person-years^b
Ever encountered bleeding events	1516	1.91%	1209	1.52%	14.0
Gastrointestinal bleeding	1068	1.34%	865	1.09%	10.0
Urogenital bleeding	158	0.20%	121	0.15%	1.4
Intracranial bleeding	145	0.18%	113	0.14%	1.3
Nose and eye bleeding	67	0.08%	39	0.05%	0.5
Other bleedings	85	0.11%	75	0.09%	0.9

total number of patients included in the cohort was 79,463; ^bthe total number of person-years was 86,615.