Prevalence, 1-year incidence and factors associated with urinary incontinence: a population based study of women 50-74 years of age in primary care.

OBJECTIVES: To study prevalence, incidence, remissions and factors associated with urinary incontinence in women 50-74 years of age.
METHODS: Cross-sectional study of prevalence and associated factors and a 1-year prospective study of incidence and remissions. A random sample of 698 women were invited for a gynecological examination in general practice in three municipalities in Northern Norway in 1994-1995. Five hundred and seven (73%) met for the first consultation, 489 of them for the second one. Questionnaires were answered by women and doctors during consultations at inclusion and 1 year later. Prevalence was estimated at three levels of evidence.
RESULTS: Any leakage was reported by 47% and regularly by 31%. For 19%, leakage was objectively demonstrated and claimed to be a social or hygienic problem. Incontinence was associated with high body weight, with poor ability to contract pelvic floor muscles and with previous gynecological operations excluding hysterectomy. Three women (0.6%) developed regular incontinence during the year of investigation. There was no convincing case of spontaneous remission.
CONCLUSION: Urinary incontinence is very frequent in women aged 50-74 years and about one in five are potential patients needing treatment. Urinary incontinence is an enduring condition with little tendency for remission without treatment.