Table 7. Correlation analysis and multivariate linear regression analysis of postoperative ICU stay.

Variable	Correlation analysis				Multivariate analysis
	Number of patients	r value	P value		B	β	P value
Age	104	−0.06	0.50		−0.004	−0.029	0.766
Disease duration	104	−0.05	0.62		−0.006	0.001	0.999
NYHA 3 or 4	104	0.09	0.38		0.590	0.118	0.226
Atrial fibrillation	104	−0.07	0.48
CRP	104	0.11	0.26
EF	104	−0.24	0.02		−0.108	−0.278	0.004
E	104	−0.01	0.97
e'	104	0.10	0.32
E/e'	104	−0.13	0.20
Ventricular septal bounce	104	0.06	0.51
Tricuspid regurgitation	86	0.04	0.72
Pericardial calcification	104	−0.07	0.49
Calcification volume	104	−0.25	0.19
Ln(calcium score +1)	104	−0.51	0.01		−0.040	−0.062	0.558
Apical sphericity index	104	0.10	0.28
Pericardial crescent sign	104	−0.05	0.61
Pericardial effusion	104	0.08	0.42
Pleural effusion	104	0.25	0.01		1.154	0.205	0.037
Ascites	104	0.17	0.09

CRP, C-reactive protein; E, early diastolic peak flow velocity of the mitral valve; e', early diastolic peak velocity of the mitral annulus; EF, ejection fraction; ln(calcium score +1), natural logarithm (ln) of the calcification score plus one; ICU, intensive care unit; NYHA, New York Heart Association.