Delphi methodology in healthcare research: How to decide its appropriateness

Table 2 Basic information of the Delphi studies included for evaluation

No.	Ref.	Identification of problem area	Selection of panel members	Anonymity of panellist	Controlled feedback	Iterative rounds	Consensus Criteria	Analysis of consensus	Closing criteria	Group stability	Number of rounds	Number of experts
1	Vitacca et al[24]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	2	20
2	Mikuls et al [25]	Yes	Yes	Not clear	Yes	Yes	Yes	Yes	Yes	No	2	14
3	Greenhalgh et al[26]	Yes	Not clear	Yes	Yes	Yes	Not clear	Yes	Yes	No	4	72
4	Lamb et al[27]	Yes	Yes	No	No	No	Yes	Yes	Yes	No	1	13
5	Welsh Surgical Research Initiative (WSRI) Collaborative[28]	Yes	No	Yes	No	No	Yes	Yes	Yes	No	1	339
6	Eibensteiner et al[29]	Yes	Yes	Not clear	Yes	Yes	No	No	No	No	4	13
z	Bhandari et al[30]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	2	34
8	Guckenberger et al[31]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	3	32
9	Aj et al[32]	Yes	No	Yes	Yes	No	Yes	Yes	Yes	No	1	339
10	Gelfand et al[33]	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	No	2	18
11	Allan et al[34]	No	No	Yes	No	Yes	Yes	Yes	No	No	3	213
12	Shanbehzadeh et al[35]	Yes	Yes	No	No	Yes	Yes	Yes	Yes	No	2	40
13	Bergman et al[36]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	No	2	21
14	Daigle et al[37]	Yes	Yes	Not clear	Yes	Yes	Yes	Yes	Yes	No	2	18
15	Sorbello et al[38]	Yes	Not clear	Not clear	Not clear	Not clear	Not clear	Not clear	Not clear	Not clear	-	0
16	Jheon et al[39]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	2	26
17	Olmos-Gómez et al[40]	Yes	Yes	Not clear	Not clear	Yes	Yes	Yes	Yes	Yes	3	441
18	Sawhney et al[41]	Not clear	Not clear	Not clear	Yes	Yes	Yes	Yes	No	Not clear	3	14
19	Sciubba et al[42]	Not clear	Not clear	No	Not clear	Yes	No	Yes	No	Not clear	3	16
20	Errett et al[43]	Not clear	Not clear	Yes	Not clear	Yes	Yes	Yes	Yes	No	3	28
21	Arezzo et al[44]	Yes	Not clear	Yes	Yes	No	Yes	Yes	Yes	No	2	55
22	Dashash et al[45]	Yes	Not clear	Not clear	Yes	No	Yes	Yes	No	No	3	20
23	Ramalho et al[46]	Yes	Not clear	Not clear	Yes	Yes	Yes	Yes	Not clear	No	2	16
24	Saldarriaga Rivera et al[47]	Yes	No	Not clear	Yes	Yes	Yes	Yes	Not clear	No	3	11
25	Tchouaket Nguemeleu et al[48]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	2	18
26	Santana et al[49]	No	Not clear	No	Yes	Yes	Yes	Yes	No	Not clear	4	6
27	Tang et al[50]	Yes	Yes	Not clear	No	Not clear	No	No	No	No	1	83
28	Jiménez-Rodríguez et al[51]	No	Yes	Not clear	Yes	Yes	Yes	Yes	Yes	No	3	16
29	Reina Ortiz et al[52]	No	Yes	Not clear	Yes	Yes	No	No	Not clear	No	2	12
30	Douillet et al[53]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Not clear	4	51
31	Richez et al[54]	Yes	Yes	No	Yes	No	No	No	Not clear	No	2	10
32	Yılmaz Yalçınkaya et al[55]	Yes	Yes	Not clear	No	No	Yes	Yes	No	No	1	60
33	Tanasijevic et al[56]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	No	3	13
34	Alarcón et al[57]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	No	3	197