Table 3.

Multivariate analysis results. In each case, forwards stepwise multilinear regression was used to arrive at the final model.

	Coefficient [95% CI]
	5-year bPFS	Grade ≥ 3 late GI toxicity	Grade ≥ 3 late GU toxicity
Time to SRT	-	-	0.2% per month [0.0–0.4]
Median SRT dose	2.5% per Gy [1.5–3.6]	1.2% per Gy [0.3 to 2.1]	0.7% per Gy [0.1–1.4]
Median PSA before SRT	–18.3% per ng/mL [–26.3 to –10.4]	-	-
	p < 0.001	P = 0.012	p = 0.010

Abbreviations: bPFS = biochemical progression-free survival, SRT = salvage radiotherapy, GI = gastrointestinal/Bowel, GU = genitourinary/Bladder.