Table 1.

Number of Participants in Each Stakeholder Group and for Each Intervention Type That Consented and Participated in Each Round of the e-Delphi Survey.

Stakeholder group	Consented	e-Delphi Round 1	e-Delphi Round 2	e-Delphi Round 3	Attrition (%)
Sound-based interventions
Health-care user	199	182	160	142	22.0
Health-care practitioner	79	70	60	57	18.6
Clinical researchers	36	35	35	34	2.9
Commercial reps and funders	24	21	19	19	9.5
Psychology-based interventions
Health-care user	118	114	97	89	21.9
Health-care practitioner	63	61	57	50	18.0
Clinical researchers	39	39	37	36	7.7
Commercial reps and funders	4	4	4	3	N/A
Pharmacology-based interventions
Health-care user	67	62	48	41	33.9
Health-care practitioner	51	47	40	37	21.3
Clinical researchers	20	17	14	13	23.5
Commercial reps and funders	19	18	15	12	33.3
Total	719a	670	586	533b	20.4

Note. Attrition refers to the percent who withdrew or dropped out between Rounds 1 and 3.

^aNote some individuals consented to participate in more than one study, and so when those duplicates have been accounted for, the 719 comprises 641 unique individuals.

^bFor those participating in more than one study, when duplicates have been accounted for, the 533 comprises 472 unique individuals.