Neurourology and Urodynamics 26:455 (2007) LETTER TO THE EDITOR Reply to Letter by S-J Wang et al. Re: Griffiths et al. 2005. Comparison of Invasive and Non-Invasive Bladder Pressure Measurements by Calculation of the Bladder Outlet Obstruction Index. Neurourol Urodynam 24:529–531 To the Editor: We thank Wang and colleagues for their continued interest in our work (ref J Urol 176: 411, 2006) but would refer them back to our previous reply regarding the development of the methodology and the previous published work comparing invasive and non-invasive pressure. The work described in the ICS conference abstract to which they now refer aimed to demonstrate that disagreement between invasive and non- invasive techniques can be accounted for by known sources of variability. It should be seen as an initial communication and we thank Wang and colleagues for suggesting further methods of data analysis. However by our understanding a paired t-test would not provide information additional to the Bland–Altman analysis. C.J. Griffiths* Department of Medical Physics Freeman Hospital Newcastle upon Tyne, United Kingdom R.S. Pickard Department of Urology Freeman Hospital Newcastle upon Tyne, United Kingdom No conflict of interest reported by the author(s). *Correspondence to: C.J. Griffiths, Departments of Medical Physics and Urology, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK. E-mail: c.j.griffi[email protected] Published online 29 January 2007 in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/nau.20344 ß 2007 Wiley-Liss, Inc.

Reply to Letter by S-J Wang et al. Re: Griffiths et al. 2005. Comparison of invasive and non-invasive bladder pressure measurements by calculation of the bladder outlet obstruction

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Page 1: Reply to Letter by S-J Wang et al. Re: Griffiths et al. 2005. Comparison of invasive and non-invasive bladder pressure measurements by calculation of the bladder outlet obstruction

Neurourology and Urodynamics 26:455 (2007)

LETTER TO THE EDITOR

Reply to Letter by S-J Wang et al.Re: Griffiths et al. 2005. Comparison of Invasive and Non-Invasive

Bladder Pressure Measurements by Calculation of the Bladder OutletObstruction Index. Neurourol Urodynam 24:529–531

To the Editor:

We thank Wang and colleagues for their continued interestin our work (ref J Urol 176: 411, 2006) but would refer themback to our previous reply regarding the development of themethodology and the previous published work comparinginvasive and non-invasive pressure. The work described in theICS conference abstract to which they now refer aimed todemonstrate that disagreement between invasive and non-invasive techniques can be accounted for by known sources ofvariability. It should be seen as an initial communication andwe thank Wang and colleagues for suggesting furthermethods of data analysis. However by our understanding a

paired t-test would not provide information additional to theBland–Altman analysis.

C.J. Griffiths*Department of Medical Physics

Freeman HospitalNewcastle upon Tyne, United Kingdom

R.S. PickardDepartment of Urology

Freeman HospitalNewcastle upon Tyne, United Kingdom

No conflict of interest reported by the author(s).*Correspondence to: C.J. Griffiths, Departments of Medical Physics and Urology,Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK.E-mail: [email protected] online 29 January 2007 in Wiley InterScience(www.interscience.wiley.com)DOI 10.1002/nau.20344

� 2007 Wiley-Liss, Inc.