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Table 1 Baseline characteristics of all patients and according to the Internal obturator muscle (IOM) mass Index

From: 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

Parameters Overall According to the IOM mass index
Low IOM High IOM p-value
Number 222 111 111  
Age (years) 67.82 ± 6.23 68.55 ± 6.11 67.10 ± 6.29 0.083
IOM (mm2/cm2) 11.23 ± 2.22    
BMI (kg/m2) 24.46 ± 2.86 24.17 ± 2.86 24.74 ± 2.85 0.136
Pre-op PSA (ng/mL) 11.61 ± 13.22 11.12 ± 12.29 12.11 ± 14.12 0.579
Prostate volume (cc) 34.58 ± 14.13 35.56 ± 15.68 33.57 ± 12.33 0.313
Type of operation     0.200
RRP 163 (73.4) 77 (69.4) 86 (77.5)  
LRP 1 (0.5) 0 1 (0.9)  
RARP 58 (26.1) 34 (30.6) 24 (21.6)  
Gleason score     0.441
 ≤ 6 59 (26.6) 24 (21.6) 35 (26.6)  
7 145 (65.3) 78 (70.3) 67 (65.3)  
8 8 (3.6) 4 (3.6) 4 (3.6)  
9 10 (4.5) 5 (4.5) 5 (4.5)  
T-stage     0.717
T2a 28 (12.6) 14 (12.6) 14 (12.6)  
T2b 38 (17.1) 19 (17.1) 19 (17.1)  
T2c 119 (53.6) 56 (50.5) 63 (56.8)  
T3a 21 (9.5) 13 (11.7) 8 (7.2)  
T3b 16 (7.2) 9 (8.1) 7 (6.3)  
N-stage     0.155
0 267 (97.1) 111 (100) 109 (98.2)  
1 8 (2.9) 0 (0.0) 2 (1.8)  
cM stage     0.316
0 221 (99.5) 110 (99.1) 111 (100)  
1 1 (0.5) 1 (0.9) 0 (0.0)  
BCR     0.871
0 173 (77.9) 87 (78.4) 86 (77.5)  
1 49 (22.1) 24 (21.6) 25 (22.5)  
  1. BMI, body mass index; pre-op PSA, pre-operative prostate-specific antigen; RRP, radical retropubic prostatectomy; LRP, laparoscopic radical prostatectomy; RARP, robot-assisted radical prostatectomy; BCR, biochemical recurrence