A small bladder capacity and more frequent urgency episodes were predictors of OAB-wet, and the above findings might indicate that OAB-wet and OAB-dry are a continuum of OAB. Older age, high maximum flow rate, high detrusor pressure at maximum flow rate and the presence of urodynamic stress incontinence were also independent predictors for OAB-wet, and the above might indicate that OAB-wet and OAB-dry have at least partly different underlying pathophysiologies.

Aims: To identify factors predicting the presence of OAB-wet and to further derive the underlying pathophysiology in OAB-wet vs. OAB-dry.

Methods: Between September 2007 and September 2013, the medical records of women with OAB who completed a 3-day bladder diary and underwent urodynamic studies in a tertiary referral center will be reviewed. OAB-wet will be diagnosed in patients who complained of at least one episode of urgency incontinence in the previous month; otherwise, OAB-dry is diagnosed. Multivariate logistic regression analysis will be used to predict the presence of OAB-wet.

Inclusion Criteria:

1. The diagnosis of overactive bladder disease
2. Female patient of more than 20 year-old

Exclusion Criteria:

1. Dominant symptoms with stress urinary incontinence (SUI)
2. Regular urethral catheterization or intermittent self-catheterization
3. Urinary tract infection or chronic inflammation in the previous 2 weeks
4. Bladder calculus
5. A history of pelvic radiotherapy
6. A preexisting malignant pelvic tumor.

Women with OAB who completed a 3-day bladder diary and underwent urodynamic studies at the urogynecologic outpatient clinics of the Department of Obstetrics and Gynecology of a medical center