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Linear regression analysis between the UPSS or NCSS and the MRCSS or INCAT scores at baseline. Whereas NCSS correlates significantly with clinical impairment (p < 0.001), ultrasound only does insufficiently, particularly with motor impairment, MRCSS (p = 0.332). INCAT = inflammatory neuropathy cause and treatment disability score, MRCSS = medical research council sum score, NCSS = nerve conduction studies score, UPSS = ultrasound pattern sum score
