Table 2.

Study characteristics for pancreaticoduodenectomy procedures; studies marked * are conference abstracts

Study name	GRADE pro quality	Procedure type	Study type	No. of cases	Matching	Mean age, years	Study quality
Boone et al. 2015 [23]	⨁⨁⨁⨁ HIGH	R	RP	200	1,2,4,5,6,7	67	******
Chen et al. 2014	⨁⨁⨁◯ MODERATE	R	P	60	1,2,3,4,5,6,7,8	53.6	****
Corcione et al. 2012	⨁⨁⨁◯ MODERATE	L	R	22	1,4,6	62	*****
Khatkov et al. 2013* [37]	⨁⨁⨁⨁ HIGH	L	P	43			****
Kim et al. 2012	⨁⨁⨁⨁ HIGH	L	R	100	1,2,4,6	50	*****
Kim et al. 2017 [38]	⨁⨁⨁◯ MODERATE	L	P	16	1,2,4,6	63.1	*****
Kim et al. 2018 [17]	⨁⨁⨁⨁ HIGH	L	R	90	6		******
Kuroki et al. 2014* [29]	⨁⨁⨁◯ MODERATE	L	R	30			***
Lu et al. 2016 [35]	⨁⨁⨁◯ MODERATE	L	RP	120	1,2,3,4,5,6,7,	59.7	*******
Nagakawa et al. 2018 [19]	⨁⨁⨁⨁ HIGH	L	R	150	1,2,4,5,6	69	*******
Napoli et al. 2016* [22]	⨁⨁⨁◯	R	RP	70			****

Matching: 1, age; 2, BMI; 3, ASA; 4, gender; 5, tumour size; 6, pathology; 7, prior surgery; 8, Pre-op albumin. Study type: R, retrospective; P, prospective; RP, retrospective evaluation of prospectively collected data. Procedure type: L, laparoscopic; R, robotic. Studies marked * are conference abstracts