Fig 2.

Response of general practices to the patent expiry of Cerazette and subsequent price change for desogestrel. Top panel=number of practices with their largest detected downward change in each month. Second panel=mean slope of the detected change for all practices changing in that month. Third panel=mean magnitude of the detected change for all practices changing in that month. Bottom panel=median Cerazette prescribing as a proportion of all desogestrel prescribing (solid line), along with deciles (dashed lines) and extreme percentiles (dotted lines)