An application of correspondence analysis method in the study of disease etiology / 中华流行病学杂志

<p><b>OBJECTIVE</b>To explore the application value of correspondence analysis in ecological study.</p><p><b>METHODS</b>We adopted correspondence analysis method to analyze the relationship between the amount of food intake in some cities in China and the male gastric carcinoma mortality.</p><p><b>RESULTS</b>According to scatter plots of row and column points, there were regional differences among the male gastric carcinoma mortality in different cities of China.</p><p><b>CONCLUSION</b>The scatter plot of row and column points indicated directly that there were regional differences among the male gastric carcinoma mortality in different cities of China. Males from the Southern part of the country ate more rice and salt, less wheaten food and fewer light vegetables than those from the northern parts, suggesting that there might be some carcinogenic factors in some food stuff involved.</p>

Study on the epidemiology and risk factors of renal calculi in special economic zone of Shenzhen city / 中华流行病学杂志

<p><b>OBJECTIVE</b>To study the epidemiological characters and risk factors of renal calculi in Shenzhen for future intervention.</p><p><b>METHODS</b>Risk factors of renal calculi were analyzed by factor analysis and linear structural relation model, followed by fitting and evaluating the model.</p><p><b>RESULTS</b>The prevalence rates of renal calculi were 8.00% and 5.12% in males and females. The results of LISEREL showed that the total effect of age and sex affecting the development of renal calculi was 0.4614, with directly effect 0.3600 and indirect 0.1014. The direct effects of blood uric acid, blood calcium and body mass index, blood cholesterol, blood sugar were 0.3400 and 0.3200 respectively. The indirect effect of education, exercise and dietary habit affected the development of renal calculi through index of biochemistry and obesity, were -0.0416 and 0.1882.</p><p><b>CONCLUSION</b>Sex, age, obesity and high blood cholesterol, high blood sugar, high blood uric acid, high blood calcium were the direct influencing factors to renal calculi. At the same time, education, exercise and dietary habit were also associated with the disease.</p>