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Content validity of a health science evidence-based practice questionnaire (HS-EBP) with a web-based modified Delphi approach.

Objective
To develop a tool for measuring evidence-based practice (EBP) and to evaluate its content validity by Delphi technique. A five-factor/dimensions latent structure for the EBP construct was defined a priori and operationalized.


Design
Online Delphi technique.


Setting and Participants
A group of 32 national EBP experts from different health professions.


Intervention
The experts rated the initial questionnaire items according to adequacy and relevance criteria using four-point Likert scales and including open fields for suggestions, with basic and supplementary criteria consensus established a priori.


Main Outcome Measure
Level of consensus in the Content Validity Index Item.


Results
An EBP construct solution was designed with the elements that constitute the operationalization proposal of the EBP. This initial version consisted of 76 items, whereas the version arising from the Delphi study was made up of 73 items. In the first round, 13 items did not reach the minimum level of consensus, and 12 of these were reformulated. Three additional items were removed in the second round.


Conclusions
A new psychometric tool forms measuring EBP with a five-factor structure, and 73 items obtained adequate content validity evidence based on expert opinion.