Staging laparoscopy in esophagogastric junction cancer: Systematic review and meta-analysis

Table 2 Number of patients included in the studies, with details on whether the different variables analyzed were or were not specified

Characteristics	Specified		Not specified
	n	Population	n	Population
Comorbidities	0	0	18	1591
Indications for laparoscopy (based on T and N)	1	41	17	1550
TNM version used	5	540	13	1051
Siewert type considered for inclusion	7	668	11	923
Method of tumor localization for Siewert classification	11	911	7	680
Patient position during procedure	2	84	16	1507
Type of access to peritoneal cavity	3	234	15	1357
Number of surgical ports	14	1258	4	333
Type of camera	4	347	14	1244
Pneumoperitoneum pressure	1	43	17	1548
Substance used for peritoneal lavage	8	766	4	418
Volume of lavage fluid	8	766	4	418
Timing of peritoneal lavage during surgery	4	237	8	947
Use of intraoperative ultrasound	7	399	11	1192
Carcinomatosis measured with scores or indices	0	0	18	1591
Study design	14	1385	4	206
Study period specified (months)	15	1255	3	336
Regions inspected	9	567	9	1024
Regions sampled for lavage	2	117	10	1067
Volume of aspirated lavage	1	81	11	1103
Surgical time	4	309	14	1282
Positive macroscopic carcinomatosis	15	1453	3	138
Positive hepatic metastases	6	434	12	1157
Positive ascites	1	43	12	1184
Cytology performed on lavage	9	826	3	358
Conversion to open surgery	0	0	18	1591
Data recording methodology	8	1052	10	539
Evaluation of complications	5	381	13	1210
Use of complication scoring system	0	0	18	1591
Postoperative length of stay	0	0	18	1591
Performed as outpatient surgery	0	0	18	1591
Follow-up duration	0	0	18	1591
Readmissions	0	0	18	1591
Days from surgery to oncological treatment	0	0	18	1591

TNM: Tumor-node-metastasis.