Figure 2
From: A model of impairment and functional limitation in rheumatoid arthritis
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.