CBCT Assessment of Ethmoid Roof Variations through Keros, Gera, and TMS Classifications

Table 8

The incidence of gera types in different populations.

Study	Country	Sample number	Modality	Gera type I (%)	Gera type II (%)	Gera type III (%)
Gera et al. [9]	Italy	190	CT	32.6	62.7	4.7
Abdullah et al. [11]	Malaysia	150	CT	23.7	72.3	4