Non-O blood group is associated with lower risk of in-hospital mortality in non-surgically managed patients with type A aortic dissection

Table 2 Associations of blood type with risk of in-hospital mortality in AD patients

Independent variable	Model 1	Model 2	Model 3
Independent variable	HR (95% CI)	HR (95% CI)	HR (95% CI)
Non-O blood group	0.668 (0.473–0.944)*	0.662 (0.468–0.935)*	0.641 (0.453–0.906)*
Age		1.010 (0.995–1.024)^&
Female gender		1.580 (1.083–2.304)*
TBAD			0.138 (0.090–0.218)*
SBP			0.987 (0.981–0.992)*
Receipt of surgery			0.129 (0.073–0.227)*

Values are based on Cox proportional hazards models. Results are shown as the hazard ratio (95% confidence interval), and statistical significance is indicated when the 95% CI does not contain the value 1. In the model, O-type was set as the reference. Model 1 was unadjusted; Model 2 was adjusted for age and sex; Model 3 was adjusted for AD type, SBP and surgery. The co-variates incorporated in Model 3 were selected based on the results of univariate Cox proportional hazards models and a multivariate step-wise logistic regression model
AD aortic dissection, TBAD type B aortic dissection, SBP systolic blood pressure, HR hazard ratio, 95% CI 95% confidence interval
^*p value < 0.05
^&p value > 0.05

ISSN: 1471-2261