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CART output illustrates a four-level decision tree (1–4). The cases partition is based on BW, AS1, AS5, ONS, SDM as prognostic factors related to abnormal outcomes (yes/no). The minimal change selection in impurity was 0.0001, whereas 5/3 were elected as minimal values for parent/child node. The hierarchy consisted of BW at level 1 and 2, SDM at level 2, AS1 and AS 5 at level 3, ONS at level 4.
