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Clinical and urodynamic predictors of Q-tip test urethral hypermobility. BACKGROUND: Urodinamics and Q-tip test represent diagnostic tools for the assessment of stress urinary incontinence. The aim of the present study is to investigate the possibility to predict the Q-tip test urethral hypermobility on the basis of clinical and urodynamic parameters. METHODS: We analyzed all women performed urodynamics between 2008 and 2016 presenting urodynamic stress urinary incontinence. Symptoms were collected by the Incontinence Questionnaire-Short Form questionnaire. RESULTS: A total of 501 women presented urodynamic stress incontinence, of which 270 had urethral hypermobility, according to the Q-tip test. Patients with urethral hypermobility were younger (p<0.0001) and presented a more advanced anterior compartment descensus according to the POP-Q system (Aa point p=0.0155; Ba point p=0.0374), a higher detrusor pressure at maximum flow (p=0.0075) and maximum flow rate compared to controls. CONCLUSIONS: Age, Aa POP-Q point and detrusor pressure at maximum flow were found to be independent predictors of Q-tip test urethral hypermobility. However, the final model can not be used as an effective predictor of the Q-tip test result.