Prognostic immune nutritional index-based nutritional stratification enhances recovery and survival in gastric cancer: A randomized controlled trial

Table 8 Correlation analysis between Prognostic Inflammatory and Nutritional Index score improvement and recovery outcomes

Variable	Pearson correlation coefficient (r)	P value	Interpretation
PSQI score improvement	0.68	< 0.01	Better sleep quality
SAS score reduction	0.65	< 0.01	Lower anxiety levels
SDS score reduction	0.61	< 0.01	Reduced depressive symptoms
EORTC QLQ-C30 improvement	0.72	< 0.01	Better quality of life
Postoperative complication rate	-0.59	< 0.01	Lower risk of postoperative complications

Pearson correlation coefficients (r) indicate the strength and direction of associations. Positive values indicate direct correlations, while negative values indicate inverse correlations. P values were adjusted using Bonferroni correction where applicable. Missing data were handled using the linear mixed model.