TABLE 3.

Log-rank test according to the type of tooth (2002-2013)

Parameters	Observed	Expected	S.E.	Relative hazard	x2	P
Maxillary anteriors	13,801	20324.11	0.027	0.901	10296.73	0.000
Maxillary premolar	20,532	24531.29	0.022	0.865
Maxillary molar	52,781	44604.58	0.014	1.223
Mandibular anteriors	5,174	8132.67	0.044	0.657
Mandibular premolar	13,320	19319.04	0.028	0.712
Mandibular molar	58,822	47518.3	0.013	1.279

S.E.: Standard error