Among CC patients, 80.1% of them were CM nonusers, and others were CM users, composed of 10.1% of high-frequency CM users and 9.73% of low-frequency CM users. On the other hand, among CC nonpatients, 76% were CM nonusers, and others were CM users, composed of 13% of high-frequency CM users and 11.0% of low-frequency CM users (Table 3).