We set out to identify predictors of successful voiding immediately after outpatient mid-urethral sling. The charts of 126 patients who underwent an outpatient mid-urethral sling procedure were identified. Using discharge without a urinary catheter as the dependent variable, logistic regression analysis modeled the relationship of independent variables including demographic, preoperative urodynamic, and perioperative variables. Sixty-one percent of the patients passed their immediate postoperative voiding trial. Logistic regression analysis revealed that parity > or = 3, Valsalva leak point pressure > 60 cm H(2)O, and high preoperative anxiety remained independently associated with successful voiding. Identifying preoperative variables that are associated with successful voiding after mid-urethral sling may be useful in helping to accurately shape patient expectations and identify those most likely to benefit from preoperative teaching of self-catheterization.