Table 1.

Age distribution (n = 100)

Frontal sinus pneumatization	Age range (years)
	18–30 years	31–40 years	41–50 years	51–60 years	61–66 years
Type 1	14 (25.9%)	5 (21.7%)	4 (26.7%)	1 (16.7%)	0
Type 2	12 (22.2%)	6 (26.1%)	3 (20.0%)	3 (50%)	0
Type 3	28 (51.9%)	12(52.2%)	8 (53.3%)	2 (33.3%)	2 (100%)
Total	54	23	15	6	2