Table 1.

Study characteristics.

Study	Study design	Surgical population	Operative approach	Patients (n)	Rate of POI (%)
Akiyoshi et al (2011)33	Prospective cohort	Colorectal resection	Laparoscopic	1,194	1.08
Artinyan et al (2008)4	Retrospective cohort	Abdominal surgery	Open	88	100
Bakker et al (2015)45	Prospective cohort	Colorectal resection	Mixed	816	11.64
Barletta et al (2011)15	Retrospective cohort	Colorectal resection	Mixed	279	8.60
Bickenbach et al (2013)35	Retrospective cohort	Gastric cancer resection	Not reported	1,853	8.60
Bisanz et al (2008)16	Retrospective cohort	Abdominal surgery	Not reported	101	43.56
Chapuis et al (2013)5	Retrospective cohort	Colorectal resection	Mixed	2,400	14.00
Englesbe et al (2010)46	Prospective cohort	Colorectal resection	Mixed	1,553	5.34
Franko et al (2006)31	Retrospective cohort	Colorectal resection	Laparoscopic	820	4.52
Grosso et al (2012)26	Retrospective cohort	Colorectal resection	Mixed	446	5.38
Hamel et al (2000)30	Retrospective cohort	Colorectal resection	Laparoscopic	85	17.64
Huang et al (2015)27	Prospective cohort	Gastric cancer resection	Mixed	296	32.43
Ichikawa et al (2016)47	Retrospective cohort	Colorectal resection	Laparoscopic	172	2.91
Juarez-Parra et al (2015)17	Retrospective cohort	Colorectal resection	Mixed	95	21.11
Kim et al (2013)28	Retrospective cohort	Gastric cancer resection	Laparoscopic	389	1.80
Kronberg et al (2011)25	Retrospective cohort	Colorectal resection	Laparoscopic	413	10.17
Le et al (2011)21	Retrospective cohort	Ileal pouch–anal anastomosis	Open	91	21.98
Millan et al (2012)29	Retrospective cohort	Colorectal resection	Mixed	773	15.91
Moghadamyeghaneh et al (2016)22	Retrospective cohort	Colorectal resection	Mixed	27,560	12.69
Murphy et al (2016)23	Retrospective cohort	Colorectal resection	Mixed	9,734	14.01
Petros et al (1995)18	Retrospective cohort	Colorectal resection	Open	358	16.20
Pikarsky et al (2002)34	Retrospective cohort	Colorectal resection	Laparoscopic	162	12.34
Tian et al (2017)19	Retrospective cohort	Colorectal resection	Mixed	5,533	7.95
Valenti et al (2007)48	Retrospective cohort	Colorectal resection	Open	273	9.15
Vather et al (2013)20	Prospective cohort	Colorectal resection	Mixed	255	19.61
Vather et al (2015)24	Prospective cohort	Colorectal resection	Mixed	327	26.91
Yamamoto et al (2013)32	Retrospective cohort	Colorectal resection	Laparoscopic	1,701	2.70

POI, postoperative ileus.