Table 7.

Cox proportional hazards model of the risk of having TKR.

				95% CI of hazard ratio
Parameters	Coefficient	Standard error	Hazard ratio	Lower limit	Upper limit	p value
Euflexxa compared with Supartz/Hyalgan	0.004	0.030	1.004	0.948	1.064	0.8806
Synvisc compared with Supartz/Hyalgan	0.067	0.020	1.069	1.027	1.112	0.0009*
Orthovisc compared with Supartz/Hyalgan	0.021	0.031	1.021	0.961	1.085	0.5071

^*Statistically significant at alpha level of 0.05.