Table 2.

Prevalence of C-shaped canal by age, gender, and side in mandibular second molars.

	Prevalence of C shape
	Present		Absent		Total
	No.	(%)	No.	(%)	No.	(%)	p
Age (years)
<30	40	(17.5)	189	(82.5)	229	(100.0)
30-39	22	(19.1)	93	(80.9)	115	(100.0)
40-49	2	(11.8)	15	(88.2)	17	(100.0)
≥50	0	(0.0)	7	(100.0)	7	(100.0)	0.734∗
Gender
Male	17	(10.4)	147	(89.6)	164	(100.0)
Female	47	(23)	157	(77.0)	204	(100.0)	0.001†
Side
Right	31	(16.8)	154	(83.2)	185	(100.0)
Left	33	(18.0)	150	(82.0)	183	(100.0)	0.747†
Total	64	(17.4)	304	(82.6)	368	(100.0)

^∗By Fisher's exact test. ^†By the chi-square test.