In this study, we crawled statistical data on 63 infectious diseases from the Korea Disease Control and Prevention Agency (KCDA) and examined the age-specific disease occurrence associations for the top 15 diseases with relatively high frequency of occurrence. Cumulative patient counts for infectious diseases were aggregated from 2001 to 2021, revealing chickenpox had the highest number of cases over the past 21 years, totaling approximately 660,000 cases. The Shannon index, reflecting disorderliness in age-specific occurrence, was highest for chickenpox, indicating concentrated disease occurrence in specific age groups. In contrast, typhoid fever showed the lowest Shannon index value, suggesting a disease with a high potential for occurrence across all age groups. Additionally, various distance metrics such as Euclidean distance, Chi-squared distance, weighted Chi-squared distance in contingency tables, and Hellinger distance were utilized to calculate the distance matrices of infectious diseases and applied multidimensional scaling. In particular, multidimensional scaling based on Hellinger distance for categorical data provided meaningful results in interpretation. According to the findings, diseases such as chickenpox, measles, mumps, and epidemic parotitis demonstrated a high occurrence frequency with a tendency for occurrence in younger age groups, forming a cluster of diseases. On the other hand, diseases like carbapenem infection, pneumococcal infection, trachoma, and hepatitis C formed a group characterized by lower occurrence frequency but occurring predominantly in older age groups.
Read full abstract