Table 4 Multivariable Cox proportional hazards regression analysis of the risk factors for 30-day mortality.

Parameters	β Coefficient	Standard error	Hazard ratio	95% confidence interval	P value
Age (years)	0.008	0.008	0.992	0.978–1.007	0.313
Time to hospitalization (hours)	−0.127	0.030	0.881	0.831–0.934	<0.001
Estimated ingestion amount (mL)	0.036	0.006	1.037	1.025–1.048	<0.001
MAP (mm Hg)	0.010	0.009	0.990	0.973–1.007	0.253
Respiratory rate (breaths/min)	−0.048	0.036	0.953	0.889–1.022	0.175
Creatinine (mg/dL)	0.000	0.001	1.000	0.998–1.002	0.869
Hemoglobin (g/L)	0.006	0.007	1.006	0.992–1.021	0.388
Albumin (g/L)	0.009	0.021	1.009	0.968–1.052	0.660
pH	−0.335	1.235	0.715	0.064–8.054	0.786
PaCO₂ (mm Hg)	0.009	0.014	1.010	0.982–1.038	0.497
Neutrophil( × 10³/mm³)	0.008	0.019	1.008	0.971–1.047	0.665
NLR	0.033	0.008	1.033	1.017–1.049	<0.001
Potassium (mmol/L)	−0.052	0.146	0.949	0.713–1.264	0.721
Plasma PQ level (μg/mL)	0.000	0.019	0.999	0.963–1.037	0.975
SIPP (μg/mL/hour)	0.003	0.002	1.003	0.998–1.007	0.221
APACHE II	0.187	0.039	1.205	1.115–1.302	<0.001

Abbreviations: PQ, paraquat; MAP, mean arterial pressure; PaCO₂, partial pressure of carbon dioxide; NLR, neutrophil-lymphocyte ratio; SIPP, the severity index of paraquat poisoning; APACHE II, the acute physiology and chronic health evaluation II score.

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