Table 4. Relationship between Caval Index and fluid responsiveness.

Baseline Caval Index		Change in MAP per unit volume (mmHg/L)	Confidence Interval
	N = 364	Mean (±SD)	95% CI	p-valueα
CI<50%	177 (48.6%)	4.0 (± 5.6)	3.6–5.1
				<0.0001
CI≥50%	187 (51.4%)	11.3 (± 6.3)	10.8–12.1

^αStatistical significance: p<0.05