title: Patient reported outcomes tools in an observational study of female stress urinary incontinence.
abstract: OBJECTIVE
  To determine which patient characteristics, incontinence and non-incontinence related, are associated with the symptom severity scores of the Urogenital Distress Inventory (UDI) and the International Consultation on Incontinence Questionnaire Urinary Incontinence (ICIQ-UI); and to determine the association of both patient characteristics and symptom severity scores with quality-of-life scores of the Incontinence Impact Questionnaire (IIQ) and the Incontinence-Quality of Life (I-QOL) questionnaire.
  
  
  METHODS
  Women presenting with stress urinary incontinence (SUI) symptoms in primary and secondary care entered the Stress Urinary Incontinence Treatment Study (SUIT), an observational study evaluating the cost-effectiveness of duloxetine compared to other non-surgical treatments for SUI. At enrollment patients completed the UDI-6, the short form ICIQ-UI, the IIQ-7 and the I-QOL. Multivariate linear regressions were performed with the UDI-6, ICIQ-UI SF, IIQ-7, and I-QOL as outcomes.
  
  
  RESULTS
  The total number of incontinence episodes is the most significant explanatory variable of the two symptom questionnaire scores, but the UDI-6 score also reflects the type of incontinence. The variability of the condition-specific quality-of-life questionnaires is primarily explained by the symptom severity questionnaire scores. Although there is a high intercorrelation, both these symptom questionnaires independently contributed significantly to the IIQ-7 and I-QOL total scores.
  
  
  CONCLUSIONS
  The UDI-6 and ICIQ-UI SF can be regarded as scientifically sound symptom questionnaires in UI evaluation; but they have differences. Since the UDI-6 and ICIQ-UI SF independently contribute to the quality-of-life scores, this suggests that in incontinence research symptom questionnaires should not focus only on incontinence, but on a broader range of urogenital symptoms.
authors.affiliation: Department of Perinatology and Gynaecology, University Medical Centre, Utrecht, Netherlands. yalcin@lilly.com
authors.forename: Huub
authors.initials: H
authors.lastname: van de Vaart
authors.forename: Christian
authors.initials: C
authors.lastname: Falconer
authors.forename: Deborah
authors.initials: D
authors.lastname: Quail
authors.forename: Louise
authors.initials: L
authors.lastname: Timlin
authors.forename: Martina
authors.initials: M
authors.lastname: Manning
authors.forename: Douglas
authors.initials: D
authors.lastname: Tincello
authors.forename: Ralf
authors.initials: R
authors.lastname: Tunn
mesh_terms: D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008875:Middle Aged; D011788:Quality of Life; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D014550:Urinary Incontinence, Stress / Q000175:diagnosis*