Nonlinear association between estimated plasma volume status and acute kidney injury in acute pancreatitis patients

Table 4 Threshold effect analysis of estimated plasma volume status and acute kidney injury using two-piecewise regression models

Two-piecewise linear regression model	D-ePVS		KH-ePVS
	OR (95%CI)	P value	OR (95%CI)	P value
Inflection point (K)	4.3		-2.8
ePVS < K	0.579 (0.335-0.998)	0.049	0.990 (0.953-1.028)	0.601
ePVS ≥ K	1.235 (1.079-1.413)	0.002	1.032 (1.005-1.06)	0.019
Likelihood ratio test		0.002		0.006
Non-linear test		0.021		0.025

Adjusted for all covariates as model 3. ePVS: Estimated plasma volume status; D-ePVS: Duarte formula-based estimated plasma volume status; KH-ePVS: Kaplan-Hakim formula-based estimated plasma volume status; OR: Odds ratio; CI: Confidence interval.