A third variable geographical area was included in case it was decided to present the data disaggregated by area. Abstract Introduction and objectives Atrial fibrillation is associated with substantial morbidity and mortality and both its incidence and prevalence are high. The overall age-adjusted prevalence of atrial fibrillation was 4. A diagnosis of AF was based on 2 criteria: All the analyses took into account the sampling design of the study. The aim of this study was to estimate the prevalence of atrial fibrillation in Spain.
In patients older than 80 years, the prevalence was Study of the population prevalence of AF, using homogeneous criteria, provides valuable information for planning appropriate strategies for the prevention and treatment of this disease. Results Overall, individuals were evaluated. In Spain, there is a lack of epidemiological data that would allow the prevalence rates of AF to be determined in the general population. Four provinces and the second hospital in Madrid were excluded or did not participate due to a variety of logistic problems. Each cardiologist was responsible for coordinating the work of these 10 physicians in his or her center. In the study population, AF was diagnosed in patients men and women. All the analyses took into account the sampling design of the study. The prevalence is similar in both sexes and rises steeply above 60 years of age. Hypertension was defined as the presence of any of the following criteria: Based on this, a 2-stage random sampling procedure was used. In the second stage participant selection , the number of people older than 40 years assigned to each physician was used as the denominator. Information on demographic variables, personal details, and general variables were collected, as well as clinical variables using a specific questionnaire for AF. A diagnosis of AF was based on 2 criteria: The study began in March and ended in October The electrocardiogram recordings were read centrally. Ten PC physicians were selected from each hospital. The remaining patients had a documented history of AF but did not have AF on the day of examination nonpermanent AF, One hospital from each Spanish province 2 in the case of Barcelona and Madrid was invited to participate in the study, as well as a referral cardiologist from each hospital. The mean age was Weighting was done in 2 stages. The data by autonomous community was not presented because the sample size calculated would provide inaccurate estimates. In total, 46 provinces and 47 hospitals and cardiologists participated. Two-stage random sampling was used, in which first-stage units were primary care physicians randomly selected in every Spanish province and second-stage units were 20 randomly selected persons drawn from each participating physician's assigned population. Selected individuals were invited to participate by the PC physician. At this time, the participating hospitals had almost PC physicians assigned to them.
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