Title

Descriptors of pain sensation: A dual hierarchical model of latent structure

Date of this Version

6-1-2012

Document Type

Journal Article

Publication Details

Citation only

Fernandez, E., Vargas, R., Mahometa, M., Ramamurthy, S., & Boyle, G. (2012). Descriptors of pain sensation: A dual hierarchical model of latent structure. Journal of Pain, 13 (6), 532- 536.

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2012 HERDC submission. FoR code: 170109

© Copyright American Pain Society, 2012

ISSN

1526-5900

Abstract

Recently, the lexicon of pain was refined into a parsimonious set of words making up the Pain Descriptor System (PDS). The present study investigated the latent structure of the sensory category of the PDS with its 24 descriptors distributed equally across 8 subcategories. A sample of 629 chronic pain patients rated the degree to which each of these words described their pain. It was found that coldness related words were rarely used and shared high covariance with other descriptors, thus warranting their removal as a subcategory. Confirmatory factor analysis of a previously theorized single higher-order model of 7 latent factors (each with 3 observed variables) resulted in poor fit, x2(181) = 377.72, P < .05; comparative fit index (CFI) = .915; root mean square error of approximation (RMSEA) = .04. This model was replaced with a dual higher-order model retaining the same 7 latent factors plus 2 higher-order factors corresponding to deep pain versus superficial pain. This model provided a good representation of the data, x2(181) = 301.07, P < .05; CFI = .948; RMSEA = .032. Therefore, descriptors of pain sensation differentiate sensory quality while also reflecting a fundamental dichotomy supported by neurophysiological research. Thus, the lexicon can illuminate pathophysiology, thereby clarifying pain diagnoses.

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This document has been peer reviewed.