. 2016 Jun 29;5(1):915. doi: 10.1186/s40064-016-2640-4

Table 1.

Incidence of cysts or tumors adjacent to impacted mandibular third molars according to age and gender

Age (years)	Group A			Group B			Total
Age (years)	Male	Female	Total	Male	Female	Total	Total
10–19	1721	1635	3356	16	8	24 (0.71 %)^a	3380 (16.248 %)^b
20–29	7019	5628	12,647	34	19	53 (0.41 %)^a	12,700 (61.051 %)^b
30–39	1950	1258	3208	26	8	34 (1.04 %)^a	3242 (15.585 %)^b
40–49	747	282	1029	18	5	23 (2.18 %)^a	1052 (5.057 %)^b
50–59	200	93	293	20	3	23 (7.27 %)^a	316 (1.519 %)^b
60–69	54	16	70	14	2	16 (18.60 %)^a	86 (0.414 %)^b
70–	13	10	23	3	0	3 (11.53 %)^a	26 (0.125 %)^b
Total	11,704	8922	20,626	131	45	176	20,802

Group A: patients who underwent surgical extraction of IMTMs

Group B: patients diagnosed with cysts or tumors adjacent to IMTMs who underwent surgical removal

^aThe percentage is calculated to divide the patients in Group B into total patients for each age group

^bThe percentage is calculated to divide the number of patients in each age group into the total number of patients