Item Analysis of the Modified Version of the Routine Blood Transfusion Knowledge Questionnaire

Abstract

Background and PurposeItem analysis is important in examining the quality of items. The main aims of this sub-study were to assess and improve the psychometric properties of the modified version of the Routine Blood Transfusion Knowledge Questionnaire (RBTKQ-2) and produce an optimized version (RBTKQ-O) of it.MethodsStatistical item analysis was performed on the RBTKQ-2 after completion by 305 nurses.ResultsThere were one (3%) easy, 15 (47%) moderately difficult, and 16 (50%) difficult items. Twenty six (81%) items and six (19%) had positive significant and weak point-biserial correlation respectively. The majority of distractors (n = 66, 64%) were functional. Four sources of information, including item analysis data, informed the development of the RBTKQ-O.ConclusionsThe RBTKQ-O addressed the limitations that were identified in the versions published earlier. This version can be used by researchers and academics worldwide.