“…Estimates for the prevalence of specific categories are: dementia with Lewy bodies (150,000), vascular dementia (112,500), and Alzheimer's disease (412,500) (calculated from rates in Stevens et al 2002); schizophrenia (1% of adult population; www.nelh. Sources: (1) Nesher et al (2001); (2) Deiker & Chambers (1978); (3) Pliskin et al (1996); (4) Teunisse et al (1996); (5) Asaad & Shapiro (1986); (6) Schultz & Melzack (1993); (7) Fernandez et al (1997); (8) Gauntlett-Gilbert & Kuipers (2003); (9) Delespaul et al (2002); (10) Vaphiades et al (1996); Others include rare disorders (under 0.5% of the population), or unsystematic series, or single case reports, for example, epilepsy, stroke, narcolepsy, pedunculopontine hallucinosis, fatal familial insomnia, and progressive supranuclear palsy.…”