. 2015 Oct 6;20:1329–1336. doi: 10.1007/s00784-015-1619-9

Table 2.

Influence of covariables on survival ratios, including level of significance, hazard ratio, and 95 % confidence intervals (final model)

Variable	Category	Number	Number of events	Hazard ratio (95 % confidence interval)	P value
Location	Maxilla^a	181	55	0.679 (0.424–1.065)	0.093
Location	Mandible	130	29	0.679 (0.424–1.065)	0.093
Number of abutment teeth	2^a	133	64	0.716 (0.418–1.177)	0.192
Number of abutment teeth	>2	78	20	0.716 (0.418–1.177)	0.192
Age of patient	>56^a	151	32	1.723 (1.112–2.710)	0.015
Age of patient	≦56	160	52	1.723 (1.112–2.710)	0.015
Operator	Dr. A^a	84	20
	Dr. B	107	20	1.147 (0.604–2.181)	0.673
	Others	120	44	2.023 (1.203–3.533)	0.001

^aReference category