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The online version of this article (doi:10.1186/1757-1146-7-7) contains supplementary material, which is available to authorized users.
The authors have no relevant conflict of interest to disclose.
PAL conceived, designed, researched data, contributed to discussion, wrote and reviewed/edited the manuscript. VN provided research assistance, researched data, contributed to discussion and reviewed/edited the manuscript. EMK conceived, contributed to discussion and reviewed/edited the manuscript. MSK, SSK and LR designed, contributed to discussion, and reviewed/edited the manuscript. CH designed, researched data and reviewed/edited the manuscript. All authors read and approved the final manuscript.
Foot disease complications, such as foot ulcers and infection, contribute to considerable morbidity and mortality. These complications are typically precipitated by “high-risk factors”, such as peripheral neuropathy and peripheral arterial disease. High-risk factors are more prevalent in specific “at risk” populations such as diabetes, kidney disease and cardiovascular disease. To the best of the authors’ knowledge a tool capturing multiple high-risk factors and foot disease complications in multiple at risk populations has yet to be tested. This study aimed to develop and test the validity and reliability of a Queensland High Risk Foot Form (QHRFF) tool.
The study was conducted in two phases. Phase one developed a QHRFF using an existing diabetes foot disease tool, literature searches, stakeholder groups and expert panel. Phase two tested the QHRFF for validity and reliability. Four clinicians, representing different levels of expertise, were recruited to test validity and reliability. Three cohorts of patients were recruited; one tested criterion measure reliability (n = 32), another tested criterion validity and inter-rater reliability (n = 43), and another tested intra-rater reliability (n = 19). Validity was determined using sensitivity, specificity and positive predictive values (PPV). Reliability was determined using Kappa, weighted Kappa and intra-class correlation (ICC) statistics.
A QHRFF tool containing 46 items across seven domains was developed. Criterion measure reliability of at least moderate categories of agreement (Kappa > 0.4; ICC > 0.75) was seen in 91% (29 of 32) tested items. Criterion validity of at least moderate categories (PPV > 0.7) was seen in 83% (60 of 72) tested items. Inter- and intra-rater reliability of at least moderate categories (Kappa > 0.4; ICC > 0.75) was seen in 88% (84 of 96) and 87% (20 of 23) tested items respectively.
The QHRFF had acceptable validity and reliability across the majority of items; particularly items identifying relevant co-morbidities, high-risk factors and foot disease complications. Recommendations have been made to improve or remove identified weaker items for future QHRFF versions. Overall, the QHRFF possesses suitable practicality, validity and reliability to assess and capture relevant foot disease items across multiple at risk populations.
Authors’ original file for figure 113047_2013_590_MOESM1_ESM.tif
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- The Queensland high risk foot form (QHRFF) – is it a reliable and valid clinical research tool for foot disease?
Peter A Lazzarini
Ewan M Kinnear
Maarten C Kamp
Suzanne S Kuys
Lloyd F Reed
- BioMed Central