Spinal cord · 2017
Rasch measurement properties of the Pain Medication Questionnaire in persons with spinal cord injury.
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Hand B N, Velozo C A, Krause J S
Аннотация
STUDY DESIGN: Secondary analysis of cross-sectional population-based self-report data.
OBJECTIVE: To determine how well the Pain Medication Questionnaire (PMQ) measures risk of pain medication misuse and its precision in separating individuals with spinal cord injury (SCI) into meaningful classification categories.
SETTING: Academic medical center in Southeastern United States.
METHODS: Data were collected from a population-based registry of SCI (n=971). Eligible participants included adults with traumatic SCI with residual effects who were at least 1 year post injury and 18 years of age and who had PMQ data in which they reported active use of pain medication at the time of the study (n=745).
RESULTS: Most items (23/26) of the PMQ contributed to a single unidimensional construct. Rasch analysis results revealed that the rating scale, majority of persons (>93%), and majority of items (20/23) fit the Rasch measurement model. The PMQ demonstrated adequate reliability (person reliability =0.67) and separated persons into two strata-those likely to misuse pain medication and those with low liklihood of misusing pain medication.
CONCLUSIONS: Findings offer a deeper understanding of the measurement properties of the PMQ as a precursor for widespread population-based studies to elucidate the incidence of pain medication misuse in persons with SCI. Results also have important research and clinical implications for commonly used PMQ total score cut-offs, which may misclassify an individual's risk of pain medication misuse.
OBJECTIVE: To determine how well the Pain Medication Questionnaire (PMQ) measures risk of pain medication misuse and its precision in separating individuals with spinal cord injury (SCI) into meaningful classification categories.
SETTING: Academic medical center in Southeastern United States.
METHODS: Data were collected from a population-based registry of SCI (n=971). Eligible participants included adults with traumatic SCI with residual effects who were at least 1 year post injury and 18 years of age and who had PMQ data in which they reported active use of pain medication at the time of the study (n=745).
RESULTS: Most items (23/26) of the PMQ contributed to a single unidimensional construct. Rasch analysis results revealed that the rating scale, majority of persons (>93%), and majority of items (20/23) fit the Rasch measurement model. The PMQ demonstrated adequate reliability (person reliability =0.67) and separated persons into two strata-those likely to misuse pain medication and those with low liklihood of misusing pain medication.
CONCLUSIONS: Findings offer a deeper understanding of the measurement properties of the PMQ as a precursor for widespread population-based studies to elucidate the incidence of pain medication misuse in persons with SCI. Results also have important research and clinical implications for commonly used PMQ total score cut-offs, which may misclassify an individual's risk of pain medication misuse.