Table 3.

Subgroup analyses

Subgroup	Cases		ICU length of stay (median days)			Overall length of stay (median days)			In-hospital mortality
	Open	Laparoscopic	Open	Laparoscopic	p#	Open	Laparoscopic	p#	Open	Laparoscopic	p value^
P-POSSUM > 10%	42,283	4194	2	2	< 0.001*	15	12	< 0.001*	23.8%	20.2%	< 0.001*
P-POSSUM > 20%	27,327	2266	2	3	< 0.001*	16	13	< 0.001*	30.2%	26.5%	< 0.001*
Colorectal Procedures	24,213	2083	1	2	< 0.001*	14	13	< 0.001*	17.4%	15.5%	0.031*
Laparoscopic Converted	59,519	3506	1	2	< 0.001*	14	12	< 0.001*	19.1%	17.8%	0.061
Laparoscopic Completed	59,519	3492	0	2	< 0.001*	14	10	< 0.001*	18.9%	14.8%	< 0.001*
Operated out of hours	25,158	2418	1	2	< 0.001*	14	11	< 0.001*	21.4%	19.3%	0.012*
Admitted to ICU	36,506	3345	2	2	< 0.001*	16	14	< 0.001*	24.7%	21.4%	< 0.001*

SMD < 0.1 was achieved for all variables in all subgroups

^#Weighted Mann–Whitney U test

^{^}Chi-square test

^*p < 0.05