analyses of these data on food frequency suggested that "Western" foods (animal
products such as beef and cheese) were associated with higher risks of idiopathic sudden
deafness, and that "Japanese" foods (plant products such as Chinese cabbage and
green tea) were associated with lower risks of this condition. So, we created an index
that corresponded to a diet comprising mainly Western foods, and a second index that
corresponded to a diet comprising mainly Japanese foods based on factor analysis.