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Effect plots of haemoglobin concentration measurements. a, Total haemoglobin concentration (THb); b, oxygenated haemoglobin concentration (O2Hb); and c, deoxygenated haemoglobin concentration (HHb). THb, O2Hb and HHb are presented as per μM. Symbols represent the estimated means with associated 95% confidence intervals for all difference time points, based on a mixed model including (non-linear) time, respiratory support and their interaction
