Comparative analysis of APACHE-II and P-POSSUM scoring systems in predicting postoperative mortality in patients undergoing emergency laparotomy

Table 1 Discriminating ability of APACHE-II

APACHE-II	Survived		Mortality		P value
	Frequency	%	Frequency	%
< 24	132	98.5	4	17.4	< 0.001
≥ 24	2	1.5	19	82.6
Total	134	100	23	100

APACHE-II: Acute physiology and chronic health evaluation II.

Table 2 Discriminating ability of P-POSSUM

P-POSSUM	Survived		Mortality		P value
	Frequency	%	Frequency	%
< 63	133	99.3	2	8.7	< 0.001
> 63	1	0.7	21	91.3
Total	134	100	23	100

P-POSSUM: Physiological and operative severity for the enumeration of mortality and morbidity.

Table 3 Sensitivity and specificity of APACHE-II and P-POSSUM

	APACHE-II	P-POSSUM	P value
Sensitivity	82.6%	91.3%	0.665
Specificity	98.5%	99.3%	1.000

APACHE-II: Acute physiology and chronic health evaluation II; P-POSSUM: Physiological and operative severity for the enumeration of mortality and morbidity.

Table 4 Discriminating ability of APACHE-II and P-POSSUM in predicting the secondary outcomes

		APACHE-II	P-POSSUM
LOS	R	0.322	0.374
	P value	< 0.001	< 0.001
Ventilatory support	R	0.554	0.572
	P value	< 0.001	< 0.001
Ionotropic support	R	0.573	0.544
	P value	< 0.001	< 0.001
Re-exploration	R	0.112	0.178
	P value	0.161	0.026
AMI or arrhythmia	R	0.507	0.518
	P value	< 0.001	< 0.001
AKI	R	0.507	0.518
	P value	< 0.001	< 0.001

APACHE-II: Acute physiology and chronic health evaluation II; P-POSSUM: Physiological and operative severity for the enumeration of mortality and morbidity; LOS: Length of stay; AKI: Acute kidney injury; AMI: Acute myocardial infarction.