Fig. 1
From: Prehospital pulse oximetry: a red flag for early detection of silent hypoxemia in COVID-19 patients
Scatter plot representing the initial SPO2 (SPO2i) and initial respiration rate (RRi) values for each patient, for COVID-19 (March 2020) and non-COVID-19 patients from the previous 3 years. The horizontal and vertical lines indicate the threshold values of SPO2 95% and respiration rate, 20 breaths per minute, respectively. We used the Kruskal-Wallis test to compare the median SPO2i/RRi value, between the period “13th to March 29, 2020,” and the three previous years (p value < 0.001). RRi, initial respiratory rate; SpO2i, initial pulse oximetry value; N, number of patients included