Table 5.

Evaluation of the relationships of various parameters with the amount of bone loss

		Amount of bone loss								Chi Square Test
		0		< 25%		25–50%		> 50%
		n	%	n	%	n	%	n	%	X2	p
Sex	Female	65	55.1	24	20.3	23	19.5	6	5.1	12.242	0.007
	Male	27	32.9	25	30.5	18	22	12	14.6
Tooth	Right premolar	48	48	22	22	21	21	9	9	0.709	0.871
	Left premolar	44	44	27	27	20	20	9	9
Presence of concavity	Absent	0	0	0	0	0	0	0	0
	Present	92	46	49	24.5	41	20.5	18	9
Origin of the concavity	Cervical third of the crown	36	50.7	13	18.3	16	22.5	6	8.5	7.950	0.539
	Cervical third of the root	50	42.7	32	27.4	23	19.7	12	10.3
	Middle third of the root	4	57.1	1	14.3	2	28.6	0	0
	Apical third of the root	0	0	0	0	0	0	0	0
	Middle third of the crown	2	40	3	60	0	0	0	0
Amount of bone loss on panoramic radiograph	0	89	89.9	10	10.1	0	0	0	0	325.381	0
	< 25%	3	6.5	33	71.7	10	21.7	0	0
	25–50%	0	0	6	15	29	72.5	5	12.5
	> 50%	0	0	0	0	2	13.3	13	86.7
Location of furcation	0	45	48.4	23	24.7	21	22.6	4	4.3	25.215	0.003
	Cervical Third	0	0	0	0	0	0	2	100
	Middle Third	16	38.1	11	26.2	9	21.4	6	14.3
	Apical Third	31	49.2	15	23.8	11	17.5	6	9.5
Number of roots	Single	45	48.4	23	24.7	21	22.6	4	4.3	4.185	0.242
	Double	47	44.3	26	24.5	20	18.9	13	12.3

n, number; X²,chi-square; p, p value