. Author manuscript; available in PMC: 2014 Jul 21.

Published in final edited form as: J Periodontol. 2013 May 31;85(2):214–225. doi: 10.1902/jop.2013.120675

Table 4.

Multivariable Cox proportional hazards model results for molar extraction (N=735).

Prognostic factor	Parameter Estimate	Standard Error	P-value	Hazard Ratio	95% Hazard Ratio Confidence Limits
Age	0.24	0.25	0.3271	1.27	0.79	2.06
Smoking	1.24	0.27	<.0001	3.46	2.04	5.88
PPD	0.79	0.14	<.0001	2.20	1.69	2.88
Mobility	0.73	0.19	<.0001	2.08	1.45	2.99
Furcation	0.19	0.09	0.0446	1.21	1.01	1.45
Molar-type	0.19	0.10	0.0574	1.20	0.99	1.46