Content Validity Test I of the Preliminary SETc-dehydration
Lynn (1986) suggested that approximately ten people are ideal size for an expert panel to evaluate content validity. The content validity of the preliminary tool was examined by eight experts who had a background in research and were working as pediatric unit managers. Five of the experts were researchers and three were head nurses working in pediatric units of general hospitals. In the case of items with similar content, the experts reviewed those items, discussed which of them were most relevant to nursing care, and then added, deleted and/or revised the items accordingly. Ultimately, 46 items related to caring for children with dehydration were selected. The experts agreed that the items were appropriate for both the learning objectives and the evaluation of clinical judgment based on the LCJR. However, they concluded that a 3-point scale would provide clearer ratings than would Lasater's 4-point scale, because, the scoring of some items in a 4-point scale can be disputable and vague, especially between the 2nd and 3rd and the 3rd and 4th points. For effective testing of clinical judgment, an evaluation tool with a clear and accurate rubric is needed. Accordingly, the rubric in this study described three levels of development for each dimension: beginning, developing, and accomplished. The expectation was that nursing students would reach the accomplished level by the end of the program.
Content Validity Test II of the Preliminary SETc-dehydration
The structure, form, comprehensibility, and item difficulty of the preliminary tool were assessed. The second content validity test was performed by 33 nursing staff members who had roles in educating, monitoring, and evaluating the nursing students. Each of them had more than 5 years of experience in the pediatric unit of a general hospital. The staff members were asked to evaluate each item's fit with to the dimensions and subcategories of the LCJR and to evaluate whether the items were related to the proper care of children with dehydration. They rated 41 items using a 4-point Likert scale: 1 = not valid at all, 2 = not valid, 3 = valid, and 4 = very valid. The content validity index (CVI) of the 41 items was above 80%.