title: Application of bland-altman method in comparing transrectal and transabdominal ultrasonography for estimating prostate volume.
abstract: BACKGROUND
  Estimating prostate volume using less invasive transabdominal ultrasonography (TAUS) instead of transrectal ultrasonography (TRUS) is of interest in terms of identifying their agreement level. Previous reports on this subject, applied general correlation coefficient as the level of agreement. This study uses Bland-Altman method to quantify TAUS and TRUS agreement on estimating prostate volume.
  
  
  METHODS
  Total prostate gland volume of 40 patients with signs and symptoms of benign prostatic hyperplasia were measured using TAUS and TRUS. The study was carried out at the Urology Research Center, Razi Hospital, Guilan University of Medical Sciences (Rasht, Iran) from March to October 2010. Both methods were performed in one session by the same experienced radiologist. Data were analyzed using Pearson correlation coefficient and Bland-Altman method.
  
  
  RESULTS
  Total prostate volume estimated by TAUS and TRUS were 50.30±23 and 50.73±24.6 mL, respectively. The limits of agreement for the total prostate volume were -6.86/9.84 that was larger than predefined clinical acceptable margin of 5 mL.
  
  
  CONCLUSIONS
  There is a lack of agreement between TAUS and TRUS for estimating the total prostate volume. It is not recommended to apply TAUS instead of TRUS for estimating prostate volume.
authors: Department of Radiology, Guilan University of Medical Sciences, Rasht, Iran;
authors: Ali
authors: A
authors: Babaei Jandaghi
authors: Department of Epidemiology, Shahid Beheshti University of Medical Science, Tehran, Iran;
authors: Maryam
authors: M
authors: Shakiba
authors: Urology Research Center, Guilan University of Medical Sciences, Rasht, Iran;
authors: Hamidreza
authors: H
authors: Nasseh
authors: Urology Research Center, Guilan University of Medical Sciences, Rasht, Iran;
authors: Yaser
authors: Y
authors: Korouji
authors: Urology Research Center, Guilan University of Medical Sciences, Rasht, Iran;
authors: Samaneh
authors: S
authors: Esmaeili
authors: Department of Biostatistics, Shahid Beheshti University of Medical Science, Tehran, Iran.
authors: Ali Akbar
authors: AA
authors: Khadem Maboudi
authors: Department of Epidemiology, Shahid Beheshti University of Medical Science, Tehran, Iran;
authors: Ali
authors: A
authors: Khorshidi
keywords: Bland-Altman approach; Cross-sectional studiy; Prostate; Ultrasonography
references: PLoS One. 2012;7(5):e37908
references: 22662248
references: AJR Am J Roentgenol. 2009 Feb;192(2):444-9
references: 19155408
references: Int Urol Nephrol. 2009 Dec;41(4):767-71
references: 19350408
references: Lancet. 1986 Feb 8;1(8476):307-10
references: 2868172
references: Br J Anaesth. 2007 Sep;99(3):309-11
references: 17702826
references: Eur Urol. 2004 Sep;46(3):352-6
references: 15306107
references: Urol J. 2009 Summer;6(3):208-13
references: 19711277
references: Prostate Cancer Prostatic Dis. 2002;5(4):273-8
references: 12627211
references: Radiol Med. 1998 Mar;95(3):182-7
references: 9638163
references: Br J Obstet Gynaecol. 1981 Aug;88(8):806-13
references: 7260001
references: Abdom Imaging. 1996 Jan-Feb;21(1):75-7
references: 8672981
references: Anesth Analg. 2000 Mar;90(3):593-602
references: 10702443
references: Br J Anaesth. 2007 Sep;99(3):329-36
references: 17631509
references: Korean J Radiol. 2008 Mar-Apr;9(2):134-9
references: 18385560
references: Eur Urol. 1988;14(4):266-9
references: 2458933
references: Neurourol Urodyn. 2006;25(7):731-8
references: 16897749
references: J Urol. 1998 Dec;160(6 Pt 1):2115-20
references: 9817335
references: Med Dosim. 2008 Autumn;33(3):234-8
references: 18674689