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Variable importance. Features that allowed high model performance were determined for RF (a) and XGB models (b). NRS, BMI, symptom duration, no thenar weakness or atrophy, and PB were among the top five features in both cases. NRS, numeric rating scale of pain; BMI, body-mass index; PB, palmar bowing; CSA, cross-sectional area; RF, random forest; XGB, extreme gradient boosting.
