Three nested randomized controlled trials of peer-only or multiple stakeholder group feedback within Delphi surveys during core outcome and information set development

Table 5 Comparison of differences between stakeholders between peer and multiple feedback groups

Core set	Mean absolute difference in mean round 2 scores between patients and professionals^a (SD)		Difference in means (peer-multiple) (95 % CI); P value^c
Core set	Peer feedback	Multiple feedback	Difference in means (peer-multiple) (95 % CI); P value^c
Colorectal	0.54 (0.40)	0.42 (0.30)	0.12 (−0.02 to 0.26); P = 0.081
Breast	0.31 (0.21)	0.14 (0.14)	0.17 (0.08 to 0.27); P < 0.001
Oesophageal^b	0.40 (0.30)	0.23 (0.17)	0.17 (0.09 to 0.26); P < 0.001

^aLinear regression adjusting for round 1 scores employed to generate absolute differences
^bBased on the 29 items included in all round 2 questionnaires
^c P value from paired t test

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