Table 4.

Risk factor combinations and mortality

	Age > 60 years	Co-morbidity*	Indication†	Necrosectomy < 28 days‡	Multiple organ failure	WBC count ≥ 23.0§	No risk factors||
Age > 60 years	41.9%, 31
Co-morbidity*	50.0%, 18	32.6%, 43
Indication†	85.7%, 7	50.0%, 6	66.7%, 18
Necrosectomy < 28 days‡	61.5%, 13	60.0%, 15	88.9%, 9	42.5%, 40
Multiple organ failure	83.3%, 6	75.0%, 8	84.6%, 13	52.4%, 21	48.5%, 33
WBC count ≥ 23.0§	100.0%, 6	80.0%, 10	88.9%, 9	76.9%, 13	68.8%, 16	62.5%, 24
No risk factors||	0.0%, 6	0.0%, 11	0.0%, 2	0.0%, 5	0.0%, 2	0.0%, 2	0.0%, 24

Bolded values represent mortality percentage at 90-day follow up after first necrosectomy in patients with the specific risk factor combination in question. Non-bolded values are the absolute number of patients with the specific risk combination in question

WBC white blood cell

*Any of the gathered co-morbidities in univariate analysis (Additional file 2)

^†Indication of necrosectomy: deterioration/prolonged organ failure

^‡From symptom onset

^§WBC count expressed as 1 × 10⁹/L. Within 24 h of first necrosectomy. One WBC count was not taken 24 h prior to operation, and thus, the last available WBC count prior to first necrosectomy was used

^||None of the risk factors presented in multivariate analysis (Table 3)