Copayments as deterrents

If you want to know if copayments deter drug consumption just ask the people.This is precisely what CEO has done. In their report p.33 they reflect that 85% of citizens have not decreased their consumption, while 13% say yes, and 2 % dont know (?). The posted question maybe is not the best since the word copayments doesn't appear and there is no adjustment over the former copayment regime (retired vs active population). Anyway, we don't know if this 13% of people that say they have reduced it, is for inappropriate medications or appropriate ones. Still looking for the right assessment, this is only the first glance.

PS. How can we measure media power?

 Andrews. From Tita Cervera  St. Feliu exhibition