Table 5. Comparison of clinical indicators between the two groups.

Variable	Calcification group (N=34)	Non-calcification group (N=70)	t/Z/χ2	P value
Postoperative low cardiac output syndrome	3 (8.8)	12 (17.1)	1.28	0.25
Postoperative ICU stay (days)	3.24±2.34	3.60±2.59	0.69	0.49
Total length of hospital stay (days)	24.32±7.36	23.44±9.10	−0.49	0.62
In-hospital death	1 (2.9)	3 (4.3)	0.11	0.73

Data are presented as mean ± standard deviation or number (%). ICU, intensive care unit.