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Table 4 Number and percentage of participants who ranked each item as their top priority in surveys 1 and 2, listed in order of the items that were most often selected as the top priority in survey 2

From: An international, Delphi consensus study to identify priorities for methodological research in behavioral trials in health research

Research itemsSurvey 1Survey 2
Tailoring interventions to specific populations and contexts79.11322.8
Methods for ensuring that behavioral interventions are implementable into practice and policy67.8814.0
Development of novel research designs to test behavioral interventions as alternatives to, or to complement, standard RCTs67.8610.5
Use of systematic approaches to move from evidence to intervention components67.858.8
Determining clinically significant changes in outcomes within trials22.658.8
Using theory in behavioral intervention development101347.0
How to disseminate behavioral trial research findings to increase implementation45.223.5
Selection of suitable comparison group(s) within trials56.523.5
Standardizing methods for reporting behavioral trials0023.5
Standardized methods for reporting and registering behavioral trials’ protocols33.923.5
Specifying intervention components79.123.5
Reporting intervention and comparison group(s) intervention content11.311.8
Measurement of process(es) of change or mechanisms of action within interventions22.611.8
Relationship between behavioral outcomes and clinical/other outcomes11.311.8
Methods to assess intervention fidelity11.311.8
Strategies to maximize trial participant recruitment and retention33.911.8
Engaging stakeholders in the selection of outcomes (New item in survey 2)n/an/a11.8
Strategies to optimize intervention fidelity (including adherence)11.300
Exploring impact of mode of intervention delivery11.300
Investigating the impact of intervention intensity on outcomes (New item in survey 2)n/an/a00
Incorporating stakeholder input in intervention development and delivery0000
How to optimize stakeholder engagement in behavioral trials’ research11.300
Determining ideal timing of outcome measurement within trials0000
Novel approaches and designs for piloting behavioral interventions22.600
Establishing criteria for progressing from trial piloting phases to full RCT22.600
Contamination between study arms (intervention and comparison) within trials0000
Testing the impact of stakeholder engagement in behavioral trial research0000
Impact on intervention delivery of characteristics (such as qualifications and training) of those delivering interventions22.600
Methods for cost-effectiveness analyses for behavioral trials0000
Trials’ research to test and develop behavioral theories0000
Strategies for handling missing data within behavioral trials0000
Developing novel statistical techniques to enhance behavioral trials0000
Blinding of researchers and participants to study-arm allocation0000
Sample-size calculations for pilot0000
Selecting appropriate behavioral outcomes for trials45.200