Table 2.

Definitions for categorical rankings of noninvasive ICP monitoring methods

Rank	Definition
1	Method is not useful, either due to being inaccurate or simply lacking enough evidence to make an assessment
2	Method may be useful as a supplement to invasive monitoring, but results are likely very limited and mixed, and more research and/or development is needed
3	Though not necessarily universally positive, evidence is generally more consistent and substantial than for rank 2 and method is likely to be useful as a supplement to invasive measurement in at least some clinical situations in the absence of technical hurdles to adoption