Table 3. Cox's univariate and multivariate analyses of biochemical recurrence-free survival according to the IE score.

	BCR-free time
	HR (95% CI)	P
Univariate
Low IE score (score 0–5)	1
High IE score (score 6–12)	0.048 (1.006–3.816)	0.048
Multivariate
IE score (high/low)	2.096 (0.787–5.581)	0.139
Gleason score (≥4+3/≤3+4)	2.726(1.329–5.590)	0.006
PSA level (>10/≤10)	1.391(0.712–2.716)	0.334
pT stage (T3/T2+PIN)	1.558(0.644–3.772)	0.325

Abbreviations: IE score=intensity score (I)×extent (E) score; PIN, prostatic intraepithelial neoplasia; PSA, prostate-specific antigen; pT category, pathological tumour category.