Table 1 Characteristics of Delphi panelists and participants in the workgroup meeting

Primary perspective

  Academia

94(86)

18(75)

  Hospital

4(4)

1(4)

  Industry

2(2)

1(4)

  Government

1(1)

0(0)

  Editor

1(1)

0(0)

  Non-profit

1(1)

0(0)

  Patient

4(4)

3(13)

  Patient representative

1(1)

1(4)

  Public member

1(1)

0(0)

Job title^a

  PhD student

6(6)

2(10)

  Research assistant

2(2)

1(5)

  Postdoctoral research fellow

15(15)

2(10)

  (Senior) researcher/research associate

16(16)

7(35)

  (Senior) lecturer

7(7)

0(0)

  (Assistant/associate) professor

35(34)

4(20)

  Clinician/therapist (various)

12(12)

1(5)

  Editor/reader/information specialist

5(5)

1(5)

  Director/dean/chair

5(5)

2(10)

Country of workplace^b

  UK

28(26)

3(13)

  Canada

27(25)

16(67)

  USA

15(14)

2(8)

  Australia

12(11)

0(0)

  Spain

9(8)

0(0)

  Netherlands

5(5)

2(8)

  Italy

3(3)

1(4)

 Japan

2(2)

0(0)

 Other^c

8(7)

0(0)

Relevant group^{a, d}

 OMI systematic review author

78(76)

12(60)

 Systematic review author

66(64)

13(65)

 OMI developer

62(60)

11(55)

 Clinician

42(41)

4(20)

 Core outcome set developer

32(31)

11(55)

 Epidemiologist

21(20)

11(55)

 Psychometrician/clinimetrician

18(17)

9(45)

 Journal editor

17(17)

4(20)

 Reporting guideline developer

12(12)

9(45)

 Biostatistician

5(5)

0(0)

Highest level of education^a

 Master’s degree

11(11)

3(15)

 MD

10(10)

1(5)

 PhD

56(54)

12(60)

 MD/PhD

26(25)

4(20)

Expertise on systematic reviews of OMIs^a

 High

57(55)

11(55)

 Average

41(40)

8(40)

 Low

5(5)

1(5)

Expertise on PRISMA^a

 High

60(58)

12(60)

 Average

36(35)

4(20)

 Low

7(7)

4(20)

Expertise on COSMIN^a

 High

37(36)

9(45)

 Average

53(51)

8(40)

 Low

13(13)

3(15)

Previously involved in research^e

 As participant

5(58)

4(100)

 As patient/public research partner

6(100)

4(100)

Previously involved in methodological research^e

 As participant

2(33)

2(50)

 As patient/public research partner

4(67)

3(75)

 Previously involved in a Delphi study^e

4(67)

3(75)