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Table 3 Test data and training data for each fivefold cross-validation, and training data after data expansion

From: Creation of an artificial intelligence model for intubation difficulty classification by deep learning (convolutional neural network) using face images: an observational study

  1. The number of facial images of patients classified into the easy and difficult groups by fivefold cross-validation is shown. The number of facial images of patients in the easy group and the difficult group in the training dataset increased by 3 and 9 times, respectively