Retrospective Data Sets
cough, chest pain, chest tightness, fever
The training data set consisted of consecutive symptomatic CXR cases at hospital A from February 1, 2014, to February 28, 2018. The inclusion criteria were patients (age ≥18 years) with symptoms who underwent posteroanterior CXR for cardiothoracic symptoms, such as chest tightness, cough, fever, and chest pain. The exclusion criteria were mobile CXR, poor image quality, and incomplete reports not drafted and confirmed by 2 radiologists.The retrospective test data set consisted of CXR cases at hospital B from April 1 to July 31, 2019, including symptomatic patients and asymptomatic screening participants. The symptomatic patients were from emergency, inpatient, and outpatient settings who met the indications for CXR. The asymptomatic participants were from the screening center. The inclusion and exclusion criteria were similar to those of the training data set, except that the screening participants were asymptomatic.The CXR images were retrieved from the picture archiving and communication system and the corresponding diagnostic reports were retrieved from the radiology information system. eTable 1 in 