Fig. 1

Consort diagram for derivation of study population and frequency of concurrent data pairs. Legend. Derivation of study population and frequency of concurrent data pairs. IBP; invasive arterial blood pressure; EPCR, electronic patient clinical record. TBI; traumatic brain injury. sICH; spontaneous intracranial haemorrhage. iSBP; Invasive systolic blood pressure. iDBP; Invasive diastolic blood pressure