A Retrospective Observational Study to Assess Prescription Pattern in Patients with Type B Aortic Dissection and Treatment Outcome

Table 4

Events rate of nonoperated TBAD patients.

Time interval	Number of patients	Numbercensored	Number failed	Event rate (%)	Total person-year	Incidence per 100 person-year
Primary endpoints (composite outcome)
≦6 months	18	3	15	83.3%	3.67	408.72
6 months~1 year	9	7	2	22.2%	7.60	26.32
1 year~3 years	40	30	10	25.0%	88.54	11.29
≧3 years	39	36	3	7.7%	159.06	1.89
Overall	106	76	30	28.3%	258.87	11.59
Hospitalization associated with aortic dissection
≦6 months	18	4	14	77.8%	3.67	381.47
6 months~1 year	10	9	1	10.0%	7.60	13.16
1 year~3 years	43	40	3	7.0%	88.54	3.39
≧3 years	35	33	2	5.7%	159.06	1.26
Overall	106	86	20	18.9%	258.87	7.73
All-cause mortality
≦6 months	6	4	2	33.3%	1.96	102.04
6 months~1 year	11	10	1	9.1%	9.19	10.88
1 year~3 years	41	34	7	17.1%	97.28	7.20
≧3 years	48	46	2	4.2%	182.94	1.09
Overall	106	94	12	11.3%	291.37	4.12
Referred to surgery repair
≦6 months	10	6	4	40.0%	3.03	132.01
6 months~1 year	12	11	1	8.3%	9.05	11.05
1 year~3 years	45	43	2	4.4%	93.50	2.14
≧3 years	39	37	2	5.1%	174.00	1.15
Overall	106	97	9	8.5%	279.58	3.22