Adolescent / Humans / INTENSIVE CARE / Male / Confidence intervals / Clinical Sciences / Intensive Care Unit / Middle Aged / Head injury / Adult / Public health systems and services research / Reproducibility of Results / Intensive Care Medicine / Bias (Epidemiology) / Fiber Optic Technology / Pressure Measurement / Frontal Lobe / Intracranial Pressure / Confidence Interval / Clinical Sciences / Intensive Care Unit / Middle Aged / Head injury / Adult / Public health systems and services research / Reproducibility of Results / Intensive Care Medicine / Bias (Epidemiology) / Fiber Optic Technology / Pressure Measurement / Frontal Lobe / Intracranial Pressure / Confidence Interval