Nationwide epidemiological survey of chronic XXXX in Japan.

@entity1 @entity788 @entity1689 @entity8883
The aim of this study was to estimate the number of @entity1 treated for chronic @entity788 in 1994 in Japan and to explore the clinico-epidemiological features of chronic @entity788 . Two surveys were conducted. Stratified random sampling was used to select departments in which @entity1 with chronic @entity788 were treated, and two different questionnaires were administered to obtain relevant information. From the first survey, the total number of @entity1 treated for chronic @entity788 in Japan in the year 1994 was estimated as 32,000 (95% confidence interval, 25,000-39,000). Clinico-epidemiological features, based on the 2,523 @entity1 reported from the second survey, were subsequently clarified. The sex ratio (male/female) of the @entity1 was 3.5. @entity8883 was the most common type in males (68.5%), and idiopathic @entity788 in females (69.6%). Compared with the findings in the last survey in 1985, the proportion of @entity1 with @entity8883 has decreased slightly, from 58.7% to 55.5%, while that of @entity1689 has increased in both males and females. @entity1 diagnosed by advanced techniques such as computed tomography (CT) and endoscopic retrograde cholangiopancreatography (ERCP) accounted for 68.1% of the total. The number of @entity1 with chronic @entity788 treated in 1994 in Japan, was estimated as 32,000, with an overall prevalence rate of 45.4 per 100,000 population in males and 12.4 per 100,000 population in females.
