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Absolute errors of SMM prediction with ranges in the test set for the seven machine learning algorithms. (A) Skeletal muscle mass (SMM); (B) fat mass (FM). Absolute errors were calculated by subtracting actual values from predicted values. The SMM and FM were divided into quintiles and Q1, Q2–Q4, and Q5. The absolute errors of predicted SMM and FM by XGBoost and ANN models were calculated in each of these three ranges.
