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Effects of Population Compared to Purposive Sampling for Consensus in an Online Delphi Study

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03505450
Recruitment Status : Enrolling by invitation
First Posted : April 23, 2018
Last Update Posted : July 24, 2018
Information provided by (Responsible Party):

Brief Summary:
This study will be nested as a randomized controlled trial within an online Delphi and will assess the effects of the population sampling compared to purposive sampling for consensus in an online Delphi.

Condition or disease Intervention/treatment
Behavior, Consumer Other: Population Sample Other: Purposive sample

Detailed Description:

The Delphi method of engaging panels of experts from specific interest areas has been widely utilized in the for the development of research reporting guidelines, core outcome sets, clinical medicine, nursing practice, medical education and healthcare services. An assessment completed by Atkins and colleagues in 2005 report that a small panel of similarly trained experts can develop reliable criteria that inform judgment and support effective decision-making. Despite the wide applicability of the Delphi methodology, it is not known how the number of participants or their similarity as a stakeholder group influences results in an online Delphi.Purposeful sampling will be used with a randomized sample taken from each stakeholder group for analysis and this analysis will be presented alongside the full analysis and the results compared.

The Protocol Lab for Online Trials-Delphi (PLOT-D), which will use an online 3-round Delphi combined with participatory action research to inform the development of a multi-use protocol template for writing protocols for self-recruited online trials of interventional self-management. The Protocol lab will use the Delphi findings, along with earlier research to redesign a series of protocols for online randomized trials with the aim of providing support for citizens to work alongside researchers to build participatory health trials online.

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Study Type : Observational
Estimated Enrollment : 300 participants
Observational Model: Other
Time Perspective: Prospective
Official Title: Effects of Population Compared to Purposive Sampling for Consensus in an Online Delphi Study
Actual Study Start Date : May 29, 2018
Estimated Primary Completion Date : September 2018
Estimated Study Completion Date : October 2018

Group/Cohort Intervention/treatment
Population sample Other: Population Sample
full sample of recruited participants

Purposive Sample Other: Purposive sample
purposive sample of recruited participants

Primary Outcome Measures :
  1. Delphi response rate differences as measured by % of completed questions between samples [ Time Frame: Up to 20 weeks or study completion ]
    Full Delphi sample compared to a 10% randomized stratified sample taken from of the 5 stakeholder groups

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
Healthy adults from an online cohort who are invited to come to consensus in an online Delphi

Inclusion Criteria:

  • Protocol lab online trials Delphi (PLOT-D) Participant

Exclusion Criteria:

  • None if meets inclusion criteria

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03505450

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United Kingdom
Oxford, Oxfordshire, United Kingdom, OX4 4DN
Sponsors and Collaborators
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Principal Investigator: Amy Price, PhD University of Oxford

Fletcher AJ, Marchildon GP. Using the Delphi Method for Qualitative, Participatory Action Research in Health Leadership. International Journal of Qualitative Methods 2014;13:1-18

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Responsible Party: ThinkWell Identifier: NCT03505450    
Other Study ID Numbers: PLOT-D Sampling Type Effects
First Posted: April 23, 2018    Key Record Dates
Last Update Posted: July 24, 2018
Last Verified: April 2018
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Yes
Plan Description: Aggregated data available by request from the study investigator
Supporting Materials: Study Protocol
Informed Consent Form (ICF)
Time Frame: Post-publication for 5 years
Access Criteria: Contact study investigator by email

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by ThinkWell:
decision support tools,