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Related Concept Videos

Reliability and Validity01:29

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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Reliability and validity testing of a single-item physical activity measure.

K Milton1, F C Bull, A Bauman

  • 1British Heart Foundation National Centre for Physical Activity and Health, School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire LE11 3TU, UK. k.milton@lboro.ac.uk

British Journal of Sports Medicine
|May 21, 2010
PubMed
Summary

A new single-item physical activity screening tool was developed and tested. Both past-week and past-month versions showed good reliability and validity for assessing eligibility for behavior change interventions.

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Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
05:59

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity

Published on: March 7, 2019

Area of Science:

  • Public Health
  • Exercise Science
  • Behavioral Medicine

Background:

  • Accurate physical activity assessment is crucial for public health interventions.
  • Existing tools can be lengthy, posing barriers to widespread use.
  • There is a need for brief, reliable screening tools to identify individuals for behavior change programs.

Purpose of the Study:

  • To develop and validate a novel single-item tool for screening physical activity.
  • To assess the tool's suitability for determining eligibility for behavior change interventions.

Main Methods:

  • Two single-item tools were created, using past-week and past-month recall periods.
  • 480 adults were recruited across England, Scotland, and Wales using quota sampling.
  • Test-retest reliability and concurrent validity (vs. Global Physical Activity Questionnaire and UK Active People Survey) were assessed via telephone interviews.

Main Results:

  • Both single-item tools demonstrated strong reproducibility (Spearman's r = 0.72-0.82).
  • The past-week version showed good agreement in classifying individuals meeting physical activity recommendations (kappa=0.63).
  • Concurrent validity was modest, with the past-week version showing stronger correlation (r=0.53) compared to the past-month version (r=0.33-0.48).

Conclusions:

  • The developed single-item physical activity measures exhibit comparable reliability and concurrent validity to existing short tools.
  • Further research is recommended to establish criterion validity against objectively measured activity and assess responsiveness to change for program evaluation.