TVT-O vs. TVT for the treatment of SUI: a non-inferiority study

International Urogynecology Journal, 08/26/2011

Yang X et al. – In the study, the transobturator vaginal tape inside–out (TVT–O) procedure could be defined to be identical to the TVT approach in success rate by non–inferiority test.


  • A cough stress test was applied to the objective outcomes, while urinary incontinence-specific quality of life questionnaire was applied to the subjective outcomes.
  • A test for non-inferiority was carried out for detecting the success rate between the two groups.


  • The objective success rates were found to be 95.4% (62/65) in the TVT group and 96.4% (108/112) in the TVT-O group.
  • No significant difference was found between these two groups in the success rate by non-inferiority test (P<0.0005), with significant improvement in quality of life and no significant difference in patient satisfaction rates in the two groups (P>0.05).

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