Abstract
INTRODUCTION: To investigate the interobserver and intraobserver agreement and performance of the North American expert agreement declaration in the assessment of chest computed tomography (CT) findings that are observed in new COVID-19 pneumonia.
 METHODS: In this retrospective study, conducted from March 15th until April 1st, 2020, 113 patients with suspected COVID-19 infection were enrolled. All patients were investigated using real-time reverse transcription polymerase chain reaction (RT-PCR) and chest CT. Chest CT features were categorized by three radiologists in accordance with the North America Consensus Statement. Characteristic and indeterminate features were considered as a group A. Atypical and negative features were considered as a group B. The interobserver and intraobserver agreement of the imaging features were evaluated along with the sensitivity and specificity of the consensus statement.
 RESULTS: The study population comprised 113 consecutive patients. Of the 113 patients, 61 were RT-PCR-positive. Group A (category 3+4) constituted 89 patients and group B (category 1+2) included 24 patients. The ICC score for intraobserver and interobserver agreement was 0.996 (95% CI) and 0.971 (95% CI), respectively. Using RT-PCR as a reference standard, the sensitivity, specificity, and negative and positive predictive values of CT findings (group A, B) for COVID-19 pneumonia were 82%, 25%, 56.1%, and 54.1%, respectively.
 CONCLUSION: The expert agreement declaration of reporting new COVID-19 pneumonia tomography findings is a well-designed, reliable, and reproducible standardized CT reporting language and shows excellent intra and interobserver agreement.
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