Table 1. Comparison of mortality among ATAAD patients in different stages within 2 years.

KDIGO stage	Total patients	Mortality (n, %)	Relative risk	95% CI	χ2	P value
No AKI	149	10 (6.7)	–	–	–	–
1	14	2 (14.3)	2.317	0.454–11.809	1.077	0.299
2	12	4 (33.3)	6.950	1.782–27.106	9.913	0.002
3	17	7 (41.2)	9.730	3.051–31.026	19.718	<0.001

AKI: acute kidney injury; ATAAD: acute Stanford type A aortic dissection; CI: confidence interval; KDIGO: Kidney Disease: Improving Global Outcomes