title: Alcoholic, but not biliary, pancreatitis varies seasonally in occurrence.
abstract: BACKGROUND
  Alcohol is the most common cause of acute pancreatitis in Finland (70%). The amount of alcohol consumed has been shown to be associated with the prevalence of pancreatitis in the country, and also to be an important determinant of the severity of the first episode of acute alcoholic pancreatitis. We have a clinical suspicion that the use of alcohol and the incidence of pancreatitis are increased during holiday periods in summer, although no seasonal variations have been reported in a German population.
  
  
  METHODS
  Between 1972 and 1992 a total of 1556 episodes with acute alcoholic pancreatitis were treated at Tampere University Hospital; 552 were first episodes and 1004 were recurrent. For comparison, we investigated 297 episodes of acute biliary pancreatitis treated in that same time period. We investigated the monthly prevalence of acute alcoholic (first and recurrent) pancreatitis and compared this with the monthly absolute alcohol consumption.
  
  
  RESULTS
  Taking all alcoholic pancreatitis episodes into account, significant differences can be seen between prevalence and month of onset of the disease (P < 0.0001), whereas among biliary pancreatitis episodes there were no differences (P = 0.3). Prevalence of acute alcoholic pancreatitis was significantly higher than the expected prevalence in July and August, and the amount of alcohol consumption (100% alcohol, litres) was highest during these same months. Also during March, October and December the prevalence was higher than expected.
  
  
  CONCLUSIONS
  Months with holiday seasons, Christmas, Easter, summer and autumn, are associated with the highest alcohol consumption and the highest prevalence of acute alcoholic pancreatitis.
authors.affiliation: Dept. of Surgery, Tampere University Hospital, Tampere, Finland. sari.raty@pshp.fi
authors.forename: S
authors.initials: S
authors.lastname: Räty
authors.forename: J
authors.initials: J
authors.lastname: Sand
authors.forename: H
authors.initials: H
authors.lastname: Alho
authors.forename: I
authors.initials: I
authors.lastname: Nordback
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001660:Biliary Tract Diseases / Q000150:complications / Q000453:epidemiology*; D005260:Female; D005387:Finland / Q000453:epidemiology; D006785:Hospitals, University / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D008875:Middle Aged; D010195:Pancreatitis / Q000453:epidemiology* / Q000209:etiology; D019512:Pancreatitis, Alcoholic / Q000453:epidemiology*; D015995:Prevalence; D012621:Seasons; D012720:Severity of Illness Index