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. 2021 Sep 6;8(1):e000939. doi: 10.1136/bmjresp-2021-000939

Figure 2.

Figure 2

Bland-Altman plots of the bias compared with SaO2 of two pulse oximeters with the lowest mean bias (Contec CMS50D1 −0.6 and Zacurate Pro series 500 DL −1.4). *Bland-Altman plots for each pulse oximeter to graphically display its bias (SpO2–SaO2) to the reference standard (SaO2). We added a zero-line and upper and lower limits of agreement (±1.96 SD). To visualise the accuracy standards required by the regulatory bodies, ±3% lines are also displayed in the figures. *Bland-Altman plots of the other pulse oximeters can be found as a supplemental figure.