Table 2. Parameters for frontal sinus ostium

Value	Male	Female	p-value
FOG
Positive	225 (81.5)	161 (84.7)	0.557
Neutral	40 (14.5)	21 (11.1)
Negative	11 (4.0)	8 (4.2)
FOD	9.93±2.80	8.70±2.63	<0.001
Level
I	129 (46.7)	61 (32.1)	0.005
II	117 (42.4)	107 (56.3)
III	27 ( 9.8)	22 (11.6)
IV	3 ( 1.1)	0 (0)

Data are presented as n (%) or mean±SD (mm).
FOG: frontal ostium grade, FOD: frontal ostium diameter.