Systemic immune-inflammation index within the first postoperative hour as a predictor of severe postoperative complications in upper abdominal surgery: a retrospective single-center study

Table 4 Factors associated with SPCs in UAS patients as determined by univariate and multivariate analyses

Variables	Univariate analysis		Multivariate analysis
Variables	OR (95% CI)	P value	Adjusted OR (95% CI)	P value
Age (years)	1.037 (1.014–1.062)	0.002**	1.032 (1.006–1.059)	0.015*
Preoperative SII (10⁹/L)	1.001 (1.000–1.001)	0.058
Postoperative lactate (mmol/L)	1.316 (1.043–1.661)	0.021*	1.468 (1.136–1.898)	0.003**
Postoperative oxygenation index	0.995 (0.992–0.997)	< 0.001***	0.995 (0.992–0.998)	0.001***
Postoperative NLR	1.013 (0.995–1.032)	0.169
Postoperative PLR	1.001 (1.000–1.002)	0.062
Postoperative SII (10⁹/L)	1.000 (1.000–1.000)	0.007**	1.000 (1.000–1.000)	0.007**
Postoperative CRP (mg/L)	1.011 (1.002–1.020)	0.014*	1.012 (1.002–1.022)	0.016*

SPC severe postoperative complications, SII Systemic immune-inflammation index, NLR neutrophil/lymphocyte count, PLR platelet/lymphocyte count, CRP C-reactive protein
*P < 0.05, **P < 0.01, ***P < 0.001

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