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Psychometric Properties and Construct Validity of the Knowledge Information Profile-Coumadin
Feleta L Wilson1, Thomas N Templin1, Cheryl K Nordstrom1
1Wayne State University, Detroit, MI, USA.
Summary
The Knowledge Information Profile-Coumadin (KIP-C14) is a refined tool for assessing patient understanding of Coumadin (warfarin) therapy. While showing promise, its reliability requires further improvement for clinical use.
Area of Science:
- Pharmacology
- Health Literacy
- Psychometrics
Background:
- Oral anticoagulation with Coumadin (warfarin) necessitates active patient engagement.
- Limited validated tools exist to assess patient knowledge of Coumadin.
- Low health literacy can hinder effective patient self-management of anticoagulation therapy.
Purpose of the Study:
- To psychometrically test the Knowledge Information Profile-Coumadin (KIP-C20).
- To determine the minimum number of items and dimensions for the KIP-C20.
- To evaluate the reliability and construct validity of the KIP-C20.
Main Methods:
- 192 participants were recruited from outpatient pharmacist-directed anticoagulation clinics.
- Instruments included the Animal Naming test (AN), Rapid Estimate of Adult Literacy in Medicine (REALM), and KIP-C20.
- Multidimensional item response theory and exploratory factor analyses were employed.
Main Results:
- The refined instrument, KIP-C14 (14 items, 3 factors), demonstrated a good fit to the data.
- Internal consistency reliability was 0.65; test-retest reliability was 0.67.
- KIP-C14 positively correlated with years of Coumadin treatment and showed differential correlations with sociodemographic variables.
Conclusions:
- The KIP-C14 exhibited reliability comparable to the KIP-C20.
- Reliability, though slightly improved, was lower than anticipated.
- The KIP-C14 shows potential as a clinical assessment scale but requires further refinement.
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