Comparison of the effect of different degrees of passive leg raising on the internal jugular vein cross-sectional area in patients before thoracic surgery

Table 5 Multivariate regression analysis of the BMI, sex, age, fasting time and preoperative rehydration with CSA

factors	Angle 0		Angle 30		Angle 50
	estimate	P-value	estimate	P-value	estimate	P-value
sex	−0.103	0.553	−0.148	0.457	0.010	0.960
age	0.008	0.215	0.008	0.305	0.012	0.105
BMI	0.004	0.605	0.008	0.349	0.010	0.212
Fasting time	0.043	0.031 ^*	0.053	0.020 ^*	0.049	0.026 ^*
preoperative rehydration	0.000	0.345	0.000	0.802	0.000	0.631

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