. Author manuscript; available in PMC: 2018 Jul 10.

Published in final edited form as: Gynecol Oncol. 2016 Jan 3;140(2):323–332. doi: 10.1016/j.ygyno.2015.12.019

Table 2a.

GRADE system for rating quality of evidence.

Evidence level	Definition
High quality	Further research unlikely to change confidence in estimate of effect
Moderate quality	Further research likely to have important impact on confidence in estimate of effect and may change the estimate
Low quality	Further research very likely to have important impact on confidence in estimate of effect and likely to change the estimate
Very low quality	Any estimate of effect is very uncertain

Reference [4].