Individualization
Korea’s administrative districts are divided into eight provinces, 77
cities, and 240 local districts. In this study, the place of residence
of patients with CE was individualized using the KNHIS-NSC database, and
the environmental factors in these individualized addresses were used as
input variables. It was thought that these individualized data would
reflect the environmental setting of each region much better than the
national average for each environmental indicator.