The aim of this study was to determine the incidence of stress urinary incontinence among women at the age of 15 and above who applied to the primary health care centers in Ankara, Turkey. We applied the urinary stress incontinence questionnaire to 2,601 women at the age of 15 or above who consulted to the "mother-child health care and family planning centers" in January 2002. To evaluate the urinary incontinence status with respect to age groups and other risk factors, chi-square test was used. Stress incontinence prevalence was 16.1% in our population. Age was a statistically significant risk factor affecting the incidence of stress incontinence. As the number of gravida increases, the frequency of stress incontinence increases (p<0.05). Presence of a systemic disease was also an important risk factor (p<0.05). Alcohol use and smoking were not found to affect the incidence of urinary stress incontinence (p>0.05). As urinary incontinence greatly influences life quality and social and psychological status of the person, and also creates economic burden, predisposing factors of stress incontinence should be well defined and measures should be taken to encourage women experiencing this problem to visit a doctor and to get an efficient treatment.