We carried out a retrospective incidence, prevalence and mortality survey of @entity1737 in the province of Reggio Emilia in Northern Italy. Based on 49 @entity1 , the mean incidence per year for the period 1980 through 1994 was 7.8 per 1,000,000. On 31 December 1994 the prevalence rate was 117.5 per 1,000,000 for all @entity1 , either active or recovered (50 cases in a population of 427,493) and 103.4 per 1,000,000 for the active disease. In the 15-year period 1980-1994 the average mortality rate was 1.0 per 1,000,000 per year. The average age at onset was 44.6 +/- 21.0, and the average age at the time of prevalence determination was 51.1 +/- 19.6 for the active disease. At the time of diagnosis, 21 @entity1 (36.8%) were classed in group I according to Osserman's criteria, 31 in group II (54.4%), (19 in group II-A and 12 in group II-B), and the other 5 (8.8%) in group III. Of all the prevalence cases, 6 (12%) were in remission without therapy and 6 with therapy, while most of the others 16 (32%) were classed in group I, 15 (30%) in group II, and 1 (2%) in group III. Thymectomy was performed in 20 @entity1 (35.1%), 12 (21%) had @entity704 (malignant in 4 cases), 6 had @entity8792 while in two @entity1 thymic histology was normal. The relation the grade of Osserman's scale at the time of incidence and the presence of @entity704 were significant. Higher grades of Osserman's scale were associated were @entity5 . Furthermore the relationship between thymectomy and the grade of Osserman's scale at the date of prevalence was significant for the presence of lower grades of Osserman's scale in the @entity1 submitted to thymectomy.

Epidemiological study of XXXX in the province of Reggio Emilia, Italy.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity704 :: ('MESH:D013945', 'Disease') :: ['thymoma'] @entity5 :: ('MESH:D009369', 'Disease') :: ['malignant thymoma'] @entity1737 :: ('MESH:D009157', 'Disease') :: ['myasthenia gravis'] @entity8792 :: ('MESH:D013952', 'Disease') :: ['thymic hyperplasia']
@entity1737 :: (MESH:D009157,Disease) :: ['myasthenia gravis']
