Table 2

Comparisons of the grades of cholecystitis

	LOS	Conversion to open	Age	SIRS	Cost	LOO
Overall p value	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
Pairwise p values
1 vs 2	0.15	1.00	1.00	0.33	1.00	0.043
1 vs 3	<0.001	0.19	0.003	0.43	0.004	<0.001
1 vs 4	<0.001	0.011	0.009	0.032	<0.001	0.005
2 vs 3	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
2 vs 4	<0.001	0.001	0.006	0.001	<0.001	0.16
3 vs 4	0.19	0.048	1.00	0.039	0.056	1.00

LOO, length of operation; LOS, length of stay;SIRS, systemic inflammatory response syndrome.