Fig. 1From: Reference values for intracranial pressure and lumbar cerebrospinal fluid pressure: a systematic reviewFlowchart of study selection process. The section “insufficient data” covers studies did not report sufficient statistical data to be included in statistical analysis. Thus, no standard deviations, confidence intervals or reference intervals were reported in these studies. The included articles “Other sources” were found by manual searching the reference list of included studiesBack to article page