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A novel metric of reliability in pressure pain threshold measurement.

Liew, Bernard and Lee, Ho Yin and Rügamer, David and De Nunzio, Alessandro Marco and Heneghan, Nicola R and Falla, Deborah and Evans, David W (2021) 'A novel metric of reliability in pressure pain threshold measurement.' Scientific Reports, 11 (1). ISSN 2045-2322

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Abstract

The inter-session Intraclass Correlation Coefficient (ICC) is a commonly investigated and clinically important metric of reliability for pressure pain threshold (PPT) measurement. However, current investigations do not account for inter-repetition variability when calculating inter-session ICC, even though a PPT measurement taken at different sessions must also imply different repetitions. The primary aim was to evaluate and report a novel metric of reliability in PPT measurement: the inter-session-repetition ICC. One rater recorded ten repetitions of PPT measurement over the lumbar region bilaterally at two sessions in twenty healthy adults using a pressure algometer. Variance components were computed using linear mixed-models and used to construct ICCs; most notably inter-session ICC and inter-session-repetition ICC. At 70.1% of the total variance, the source of greatest variability was between subjects ([Formula: see text] = 222.28 N<sup>2</sup>), whereas the source of least variability (1.5% total variance) was between sessions ([Formula: see text] = 4.83 N<sup>2</sup>). Derived inter-session and inter-session-repetition ICCs were 0.88 (95%CI: 0.77 to 0.94) and 0.73 (95%CI: 0.53 to 0.84) respectively. Inter-session-repetition ICC provides a more conservative estimate of reliability than inter-session ICC, with the magnitude of difference being clinically meaningful. Quantifying individual sources of variability enables ICC construction to be reflective of individual testing protocols.

Item Type: Article
Divisions: Faculty of Science and Health > Sport, Rehabilitation and Exercise Sciences, School of
Depositing User: Elements
Date Deposited: 03 Sep 2021 11:50
Last Modified: 03 Sep 2021 11:50
URI: http://repository.essex.ac.uk/id/eprint/31045

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