Figure 1.

Body weight cut-off point for ICU admittance. This figure shows the decision tree of ICU admittance. Node 0 means ICU admittance of all patients, 34 being admitted to ICU after surgery and 233 not. Through Classification and Regression trees approaches, body weight at surgery was identified as an independent risk factor. When body weight ≤ 3.15 kg, the incidence ICU admittance was 25/90 (27.8%),but when[[Inline Image]] body weight>3.15 kg, the incidence was 9/177 (5.1%). infant who had recurrent desaturation (<90%) and could not be relieved by oxygen supply through a face mask would be admitted to ICU for further monitoring and treatment.