Nurses' evidence-based knowledge and self-efficacy in venous access device insertion and management: Development and validation of a questionnaire.

Content validity indices and results from the pilot study were excellent with all the item-content validity indices >0.78 and scale-content validity index ranging from 0.96 to 0.99. The survey was completed by 425 nurses. Difficulty and discrimination indices for knowledge items were acceptable with most items (58.8%) showing desirable difficulty and most items (58.8%) with excellent (35.3%) or good (23.5%) discrimination power, and appropriate to the content. The dimensionality of the model posited for self-efficacy was confirmed with adequate fit indices (e.g., comparative fit index range 0.984-0.996, root mean square error of approximation range 0.054-0.073). Construct validity was determined and reliability was excellent with alpha values ranging from 0.843 to 0.946 and omega coefficients ranging from 0.833 to 0.933. Therefore, a valid and reliable tool based on updated guidelines is made available to evaluate nurses' competencies for venous access insertion and management.