Lack of Anatomical Concordance between Preablation and Postablation CT Images: A Risk Factor Related to Ablation Site Recurrence

Table 3

Cox proportional hazard model showing the relative risk for development of ablation site recurrence compared to the reference standard (1.0).

	Relative risk (95% CI)	P value
RFA approach
Open RFA	1.0	0.001
CT-targeted RFA	9.5 (2.6–34.0)
Similarity of Positioning Score (SiPS)
SiPS-identical	1.0	0.019
SiPS-different	3.9 (1.2–12.3)
Index-tumour size
<20 mm	1.0	0.010
≥20 mm	3.6 (1.4–9.4)