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Table 3 Analyses of factors that influence the accuracy of 3DUS to CBCT

From: Analyses of the factors influencing the accuracy of three-dimensional ultrasound in comparison with cone-beam CT in image-guided radiotherapy for prostate cancer with or without pelvic lymph node irradiation

  N % SI P % LR P % AP P
OR (95% CI) OR (95% CI) OR (95% CI)
Age (years)
 ≤ 70 21 28.7 1   10.5 1   17.5 1  
 > 70 28 35.6 1.37 (1.07, 1.76) 0.012 14.6 1.46 (1.02, 2.08) 0.036 26.5 1.70 (1.28, 2.26) < 0.001
Irradiated with pelvic lymph nodes
 No 27 29.9 1   10.8 1   20.9 1  
 Yes 22 35.7 1.30 (1.02, 1.67) 0.036 15.1 1.47 (1.04, 2.07) 0.03 24.1 1.20 (0.91, 1.59) 0.189
3DUS modality
 TAUS 30 32.2 1   16.6 1   21.5 1  
 TPUS 19 32.7 1.02 (0.80, 1.31) 0.85 7.9 0.43 (0.30, 0.63) < 0.001 23.3 1.11 (0.84, 1.46) 0.476
Bladder volume (mL)     0.093    0.004    0.031
 < 300 10 35.3 1   7.6 1   15.8 1  
 300~399 11 29.3 0.76 (0.53, 1.10) 0.147 18.1 2.70 (1.56, 4.68) < 0.001 24.5 1.73 (1.12, 2.66) 0.013
 400~499 12 28.2 0.72 (0.51, 1.03) 0.07 11.7 1.62 (0.92, 2.87) 0.098 25.1 1.78 (1.17, 2.70) 0.007
 ≥ 500 16 35.9 1.03 (0.74, 1.43) 0.862 13.8 1.96 (1.14, 3.36) 0.015 23.6 1.64 (1.09, 2.46) 0.017
Rectum volume (mL)     0.498    0.42    0.079
 < 40 18 34.2 1   14.2 1   20.5 1  
 40~59.9 15 32.5 0.93 (0.69, 1.25) 0.618 12.6 0.87 (0.58, 1.31) 0.504 26.2 1.38 (0.99, 1.92) 0.055
 ≥ 60 16 30.3 0.84 (0.62, 1.13) 0.238 11.1 0.75 (0.49, 1.15) 0.189 20.3 0.99 (0.70, 1.40) 0.941
  1. CBCT Cone-beam computed tomography, 3DUS Three-dimensional ultrasound, TAUS Transabdominal ultrasound, TPUS Transperineal ultrasound, SI Superior-inferior, LR Left-right, AP Anterior-posterior, OR Odd ratio, CI Confidence interval