Computed tomography 3D reconstruction and texture analysis for evaluating the efficacy of neoadjuvant chemotherapy in advanced gastric cancer

Table 4 Comparison of volume and thickness change rates and correlation with postoperative pathological tumor regression grade

	Chemotherapy ineffective group (n = 35)	Chemotherapy effective group (n = 62)	Z	P1	r	P2
Tumor volume change rate (%)	41.75 (32.86, 48.52)	75.20 (65.42, 82.35)	7.246	< 0.001	0.886	< 0.001
Tumor thickness change rate (%)	29.83 (24.53, 35.62)	40.65 (35.28, 46.92)	5.835	< 0.001	0.725	< 0.001

Data is expressed as median (interquartile range). P1 is the P-value for inter group comparison; P2 is the P-value for correlation analysis with tumor regression grade grading; R is the Spearman correlation coefficient.