Effect of pre-operative internal obturator muscle mass index in MRI on biochemical recurrence of prostate cancer patients after radical prostatectomy: a multi-center study

Table 3 Cox proportional hazards model analysis of biochemical recurrence

Parameter	HR	95% CI	p-value
Age (years)	0.945	0.892–1.000	0.049
IOM (mm²/cm²) (low vs. high)	0.891	0.462–1.719	0.731
BMI (kg/m²)			0.142
≤ Normal	–
Overweight	0.880	0.379–2.042
Obesity	0.455	0.195–1.063
Pre-op PSA (ng/ml)	1.064	1.045–1.083	< 0.001
Prostate volume (cc)	1.016	0.990–1.042	0.226
Gleason score			0.364
≤ 6	–
7	1.263	0.478–3.340
8	1.473	0.317–6.844
9	3.064	0.798–11.760
ECE (no vs. yes)	5.551	2.011–15.322	0.001
Resection margin (– vs. +)	1.040	0.479–2.262	0.920
T-stage			0.004
T2a	–
T2b	13.260	2.218–79.262
T2c	3.157	0.609–16.373
T3a	1.564	0.177–13.785
T3b	4.830	0.700–33.326
N-stage (no involvement vs. LN involvement)	0.300	0.028–3.202	0.319
M-stage (no meta vs. meta)	0.000	0.000–	0.985

IOM, internal obturator muscle mass index; BMI, body mass index; pre-op PSA, pre-operative prostate-specific antigen; ECE, extracapsular extension; LN, lymph node

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