Fig. 1

Flow diagram summarizing article selection; 83 articles were identified:64 reported accuracy, 37 reported drift (some reported both). Articles on animals, with probes placed in the epidural, subdural, or infratentorial spaces and with inadequate data reporting were excluded. High-quality articles on drift reported the range, mean and median of drift; the 17 papers refer to 20 studies. High-quality articles on accuracy included comparisons of two ICP probes, with Bland-Altman analysis and adequate data reporting; the 10 papers listed refer to 15 studies