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. 2005 Mar 15;6:16. doi: 10.1186/1471-2474-6-16

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Copyright © 2005 Escalante et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Frequency distributions of the joint inflammation (JI) impairment latent variable. This was computed from JI = JT^1/2+ JS^1/2× 0.445 + JP^1/2× 0.837, where JT = joint tenderness, JS = joint swelling, and JP = joint pain. Weights were estimated using maximum likelihood with Amos, after constraining the coefficients for JT and DUL to 1. The latent variable was then rescaled to vary from 0 to 100.