Association between climatic elements and acute appendicitis in Japan

The Journal of Surgical Research
Yasuto SatoAppendicitis study group of Mobi-kids Japan

Abstract

In Japan, it has been reported that an increase in atmospheric pressure is associated with a higher incidence of acute appendicitis. The aim of this epidemiologic study was to investigate the association between climatic elements and the incidence of acute appendicitis. A case-crossover design was used in the present study. Two wk before diagnosis was used for the target period. The same 2-wk period, but 1, 2, and 3 y before diagnosis, was used for the control period. The study participants were patients with acute appendicitis (10-29 y) from 14 facilities in the Greater Tokyo Area. Mean of the observed values for atmospheric pressure, temperature, relative humidity, and hours of sunshine calculated for each target and control period were used as climatic elements to investigate trends 1 and 2 wk before diagnosis. The year of diagnosis, a statistically significant moderate upward trend in atmospheric pressure was observed during the 2-wk period before diagnosis of acute appendicitis (tau = 0.47; P = 0.0213), whereas a weak nonsignificant downward trend was observed 1 y before diagnosis (tau = -0.29; P = 0.1596), and weak nonsignificant upward trends were observed 2 (tau = 0.24; P = 0.2505) and 3 y (tau = 0.28; P = 0.1634) befor...Continue Reading

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