similar results have been found by epidemiological and primarycare studies in different countries eg kessler et al treatment rates increase with age data from the national surveys of australia the united states and switzerland show that treatment is most prevalent in the age groups and over and particularly low among those under age eurobarometer data confirm this pattern showing a continuous increase of treatment rates across age groups figure the average of the oecd countries is for younger people years for adults years and for seniors years source oecd calculations based on national health surveys for disorder prevalence and eurobarometer for treatment rates