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Frequency distributions of the joint deformity (JD) impairment latent variable. This was computed from JD = DUL + DLL × 0.478 + DOJ × 0.011, where DUL = deformity upper limb, DLL = deformity lower limb, and DOJ = deformity other joints. The weights for the equation 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.
