Table 2.

Consensus classification

Consensus classification	Description	Definition
Consensus in (parent-weighted vote)	Consensus that outcome should be included in the core outcome set	70% or more participants overall scoring as 7 to 9 AND < 15% participants scoring a 1 to 3 OR > 70% or more of parent group scoring as 7 to 9
Consensus out	Consensus that outcome should not be included in the COS	50% or fewer participants scoring as 7 to 9 in each stakeholder group
Neither consensus in nor consensus out (undetermined consensus)	Uncertainty about importance of outcome so retain for next round	Anything else