Table 2.

Comparison of TBI classification criteria.

Class of injury	Greenwald et al. (18)	Rao and Lyketsos (19)
Mild	Cognitively altered or loss of consciousness less than 30 min	Loss of consciousness less than 30 min
Moderate	Cognitively altered or loss of consciousness 30 min to 6 h	Loss of consciousness 1–24 h
Severe	Loss of consciousness greater than 6 h	Loss of consciousness more than 24 h