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Related Experiment Video

Updated: Feb 14, 2026

Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity

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Published on: June 12, 2019

Rater reliability and construct validity of a mobile application for posture analysis.

Kimberly A Szucs¹, Elena V Donoso Brown¹

¹Department of Occupational Therapy, Duquesne University: 600 Forbes Avenue, Pittsburgh, PA, USA.

Journal of Physical Therapy Science

|February 8, 2018

Summary

A new mobile app for posture analysis shows high accuracy and reliability for measuring posture. This cost-effective tool could benefit both clinical settings and musculoskeletal disorder research.

Keywords:

Construct validity Posture Reliability

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Last Updated: Feb 14, 2026

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Area of Science:

Biomechanics
Digital Health
Musculoskeletal Health

Background:

Accurate posture measurement is crucial for understanding musculoskeletal disorders.
A reliable, low-cost, and accessible posture assessment tool is needed for research and clinical practice.

Purpose of the Study:

To evaluate the rater reliability and construct validity of a mobile application designed for posture screening.
To assess the app's utility in quantifying posture variables in healthy young adults.

Main Methods:

Two raters digitized static standing posture images of subjects in three positions, twice each.
The application calculated sagittal and coronal plane translations and angulations.
Intra- and inter-rater reliability (ICC) and construct validity (ANOVA) were assessed.

Main Results:

Intra-rater reliability ranged from 0.71 to 0.99, with good to excellent inter-rater reliability for translations.
Intraclass correlation coefficients (ICCs) were stronger for translations than for angulations.
The app successfully detected changes in selected posture variables, indicating construct validity.

Conclusions:

The mobile posture application demonstrates strong rater reliability and initial evidence of construct validity.
This application shows potential for use in clinical posture assessments and research settings.
Further validation may enhance its role in managing musculoskeletal health.