Laparoscopic versus open approach in gastrectomy for advanced gastric cancer: a systematic review

Table 2 Assessment of quality of RCTs (Jadad scale)

References	Year	Randomization	Withdraw and dropout	Jadad’s score
Wang et al. [48]	2019	2	0	2
Lee et al. [47]	2019	2	0	2
Shi et al. [44]	2018	2	0	2
Park et al. [43]	2018	2	2	4
Li1 et al. [35]	2016	2	0	2
Hu et al. [34]	2016	2	2	4
Cai et al. [15]	2011	1	1	1
Cui et al. [30]	2015	2	0	2

Randomization: randomization was described with appropriate method—2 score, randomization was described without appropriate method—1 score, no randomization—0 score. Blinding: blinding was performed on all doctors and patients—2 score, blinding was partially performed on doctors and patients—1 score, no blinding—0 score. Withdraw and dropout: the reason of withdraw and dropout was described—1 score, the reason of withdraw and dropout was not described—0 score. Quality: high-quality trials should score ≥ 3, moderate-quality trials should score ≥ 2

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