Table 3.

Predictive value of clinical risk scores for SCC development during study

Variable	Univariate		Without age component
	HR (95% CI)	P Value	HR (95% CI)	P Value
Harden risk score	1.41 (1.10 to 1.81)	0.01	1.24 (0.78 to 1.97)	0.36
Urwin risk score	1.42 (1.10 to 1.83)	0.01	1.29 (0.94 to 1.76)	0.12
Harwood risk score	1.56 (1.10 to 2.22)	0.01	NA	NA

Variables are expressed as a HR per unit increase in score, calculated by Cox modeling. The univariate analysis was then repeated using the risk score without the age component. It was not possible to do this for the Harwood score due to the nature of the score.

HR, hazard ratio; 9% CI, 95% confidence interval; NA, not applicable.