PMB has released the 2005 Medical Media Study. The study, conducted by PMB since 2000, uses a random sample of 3,000 GPs and other physicians to measure the readership of 31 publications, and also covers medical activities, including drug prescribing patterns. For instance, Canadian physicians prescribe on average 12.3 non-narcotic analgesics per week, 11.7 antibiotics and 10.1 anticholesterols. Plus, physicians write 3.3 prescriptions per week for erectile difficulty drugs.