The relationship between urinary symptom questionnaires and urodynamic diagnoses: an analysis of two methods of questionnaire administration.

Objective: To assess whether method of administration of a standard urinary symptom questionnaire alters the relationship of symptoms with urodynamic diagnoses.

Design: Randomised crossover study.

Setting: Tertiary Urogynaecology Unit, London, UK.

Participants: One hundred and fourteen women attending a tertiary urogynaecology clinic.

Methods: Women were randomised to either an initial interview-assisted questionnaire in the clinic with a follow up postal questionnaire or an initial pre-outpatient questionnaire followed by an interview-assisted questionnaire at the clinic visit. Video cystourethrography or saline cystometry was performed at the clinic visit.

Main Outcome Measures: Question responses were compared with urodynamic diagnoses.

Results: With an interview method, only severity of incontinence was significantly associated with detrusor overactivity (U= 593.5, P= 0.012). With self-completion, severity of nocturia (U= 477, P < 0.05), urgency (U= 395, P= 0.003), urge urinary incontinence (U= 392, P= 0.003), leakage without warning (U= 443, P= 0.035) and incomplete voiding (U= 413, P= 0.01) were significantly associated with detrusor activity. On interview the symptom of stress urinary incontinence (U= 523, P= 0.002) and use of pads (U= 564.5, P= 0.011) were significantly associated with a diagnosis of urodynamic stress incontinence. Severity of stress urinary incontinence (U= 276, P < 0.001), frequency of leakage (U= 348.5, P= 0.004), use of protection (U= 432.5, P < 0.018), nocturnal incontinence (U= 393.5, P= 0.002) and quantity of leakage (U= 441.5, P < 0.05) on self-completion were strongly associated with diagnosed urodynamic stress incontinence. There was no association between the symptoms of urgency or urge incontinence and the urodynamic stress incontinence.

Conclusions: Postal questionnaire responses have a better relationship with urodynamics, both for urodynamic stress incontinence and detrusor over activity, than interview-assisted questionnaire responses. However, no symptom has a high enough specificity and sensitivity to replace urodynamic testing.