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Reliability and Validity

Reliability and Validity

Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.

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Biomechanical Changes Related to Low Back Pain: An Innovative Tool for Movement Pattern Assessment and Treatment Evaluation in Rehabilitation

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The patient enablement instrument for back pain: reliability, content validity, construct validity and

A Molgaard Nielsen¹, J Hartvigsen^2,3, A Kongsted^2,3

¹Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark. amnielsen@health.sdu.dk.

Health and Quality of Life Outcomes

|April 10, 2021

Summary

A new tool, the Patient Enablement Instrument for Back Pain (PEI-BP), effectively measures self-management in non-specific low back pain patients. This valid and reliable instrument aids in assessing patient enablement during care.

Keywords:

Low back pain Outcome assessment Primary care Reliability Validity

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Area of Science:

Rehabilitation Medicine
Clinical Measurement
Health Psychology

Background:

No existing outcome measures assess self-management for non-specific low back pain (LBP).
The Patient Enablement Instrument for Back Pain (PEI-BP) was developed, inspired by the Patient Enablement Instrument.
The study aimed to evaluate the PEI-BP's measurement properties.

Purpose of the Study:

To describe the development of the PEI-BP.
To investigate the content validity, construct validity, internal consistency, test-retest reliability, measurement error, responsiveness, and floor/ceiling effects of the PEI-BP.

Main Methods:

The PEI-BP uses a 6-item, 0-10 Numeric Rating Scale.
Measurement properties were assessed using COSMIN standards across three primary care LBP cohorts.
Comparisons were made with established measures for disability, beliefs, fear avoidance, and mental health.

Main Results:

The PEI-BP demonstrated acceptable content validity, construct validity, reliability, and responsiveness.
The Smallest Detectable Change was 10.1 points.
A potential ceiling effect was noted at baseline due to high scores.

Conclusions:

The PEI-BP is a valid and reliable tool for measuring enablement in non-specific LBP patients.
Further validation in more severe LBP populations is recommended.