Table 2.

Correlations between AQP1, AQP2, AQP4, and AQP9 plasma concentrations and radiological characteristics of acute SDH before surgery, 30 h post-surgery, and change in the variables.

Variable	AQP1			AQP2			AQP4			AQP9
	n	R	p	n	R	p	n	R	p	n	R	p
Before surgery
Hematoma volume	21	−0.327	0.148	21	−0.161	0.486	21	−0.446	0.054	21	−0.326	0.149
Midline shift	21	−0.010	0.964	21	−0.196	0.395	21	0.213	0.355	21	0.052	0.823
15 h post-surgery
Hematoma volume	21	−0.034	0.884	21	−0.104	0.654	21	−0.028	0.904	21	−0.157	0.508
Midline shift	21	0.174	0.451	21	−0.025	0.913	21	0.093	0.690	21	−0.008	0.972
Post-surgery
Hematoma volume	20	−0.068	0.777	21	0.209	0.364	21	−0.010	0.964	21	−0.012	0.958
Midline shift	20	0.184	0.437	21	0.112	0.628	21	0.068	0.770	21	−0.003	0.991
Change
Hematoma volume	20	0.120	0.613	21	0.330	0.144	21	−0.130	0.575	21	−0.068	0.771
Midline shift	20	−0.036	0.880	21	0.169	0.464	21	0.073	0.752	21	0.130	0.574

n—sample size; R—Spearman’s rank correlation coefficient; p—significance level for Spearman’s coefficient.