The degree to which individuals are involved in the New Age varies. Heelas argued that those involved could be divided into three broad groups; the first comprised those who were completely dedicated to it and its ideals, often working in professions that furthered those goals. The second consisted of "serious part-timers" who worked in unrelated fields but who nevertheless spent much of their free time involved in movement activities. The third was that of "casual part-timers" who occasionally involved themselves in New Age activities but for whom the movement was not a central aspect of their life. MacKian instead suggested that involvement could be seen as being layered like an onion; at the core are "consultative" practitioners who devote their life to New Age practices, around that are "serious" practitioners who still invest considerable effort into New Age activities, and on the periphery are "non-practitioner consumers", individuals affected by the general dissemination of New Age ideas but who do not devote themselves more fully to them. Many New Age practices have filtered into wider Western society, with a 2000 poll, for instance, revealing that 39% of the UK population had tried alternative therapies.