OBJECTIVES: To evaluate the sensitivity to change of the Spanish version of the ICIQ-UI SF questionnaire, in order to recommend its use in clinical practice to evaluate treatment outcome for Urinary Incontinence (UI). METHODS: Prospective study of 115 women with diagnostic of Stress UI (SUI) who received treatment for their incontinence: Pelvic floor training (PFT) or surgery. All the patients had clinical and urodynamic diagnosis at inclusion, along with the ICIQ-UI SF score. After six months, the treatment outcome was clinically evaluated and the ICIQ-UI SF was newly applied. Mean pre and post-treatment ICIQ-UI SF scores were compared for the whole sample and for the two treatment groups. Mean scores were also compared between “cured” patients and the rest (“improved” or “no change”). Reliability was assessed with the Cronbachxs alpha before and after treatment. Percentage of agreement and Cohenxs Kappa were calculated for the ICIQ-UI SF with respect to clinical outcomes. RESULTS: From all the patients treated with PFT (N=53), 26 (54.2%) were cured. From all the patients treated with surgery (N=62), 35 (62.5%) were cured. Post-treatment scores were lower than pre-treatment scores: 4.1 (3.6) vs. 12.3 (4.3) for PFT (p=0.000); and 2.1 (4) vs. 11.1 (6.3) for surgery (p=0.000). Post-treatment scores for cured patients were lower than that of not cured 2.4 (3) vs. 5.2 (3.3) for PFT (p=0.03); and 0.7 (1.3) vs. 4.5 (5.8) for surgery (p=0.008). Pre- and post-treatment Cronbachxs alpha were 0.91 and 0.94. The agreement for the ICIQ-UI SF was moderate. CONCLUSIONS: The Spanish version of the ICIQ-SF questionnaire can adequately evaluate the change after treatment in groups of patients with SUI.