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

March 18, 2021 updated by: ThinkWell
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.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

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.

Study Type

Observational

Enrollment (Actual)

385

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United Kingdom
    • Oxfordshire
      • Oxford, Oxfordshire, United Kingdom, OX4 4DN
        • ThinkWell

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

Healthy adults from an online cohort who are invited to come to consensus in an online Delphi

Description

Inclusion Criteria:

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

Exclusion Criteria:

  • None if meets inclusion criteria

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Population sample
Other: Population Sample
full sample of recruited participants
Purposive Sample
Other: Purposive sample
purposive sample of recruited participants

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
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
Up to 20 weeks or study completion

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

ThinkWell

Investigators

  • Principal Investigator: Amy Price, PhD, University of Oxford

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

May 29, 2018

Primary Completion (Actual)

September 30, 2018

Study Completion (Actual)

October 29, 2018

Study Registration Dates

First Submitted

April 1, 2018

First Submitted That Met QC Criteria

April 20, 2018

First Posted (Actual)

April 23, 2018

Study Record Updates

Last Update Posted (Actual)

March 22, 2021

Last Update Submitted That Met QC Criteria

March 18, 2021

Last Verified

March 1, 2021

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • PLOT-D Sampling Type Effects

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Aggregated data available by request from the study investigator

IPD Sharing Time Frame

Post-publication for 5 years

IPD Sharing Access Criteria

Contact study investigator by email

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • ICF

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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