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. 2019 Mar 1;6(1):e000351. doi: 10.1136/bmjresp-2018-000351

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Relationship between arterial oxygen content (CaO₂) and oxygen saturation (SaO₂). CaO₂ across all degrees of hypoxaemia was calculated by SaO₂ × haemoglobin × 1.34/100, where SaO₂ was expressed as %, and 1.34 mL is the amount of oxygen carried per gram of haemoglobin.²⁰ The bold black line represents the regression line for all patients, irrespective of iron status (p=0.87). Grey circles/dotted line/shaded 95% confidence intervals (CIs) represent patients without iron deficiency (p=0.27). Red circles/dotted line/shaded 95% CIs represent patients with iron deficiency (p=0.27).