The Lundby Study was established in the international tradition of descriptive epidemiology in the mid-20th century. Other studies together with the Lundby study have been established, such as the Stirling County (Canada). The Lundby Study is still in operation, and is the only study in the world based on incidence monitoring on a person based long-time follow-up design. There have been several personal field investigations; 1947, 1957, 1972 and 1997, which the latter thus was a 50-year follow-up. Data are of high quality, e.g. validated by personal interviewing of the cohort, validating comparability of diagnoses from various classifications systems used over the period from 1947 until the latest DSM IV. In all about 42% of the population had suffered from a mental disorder during their lifespan.
Mental health in a community sample has been followed in a very long perspective, which is valuable for the planning of preventative efforts. Background factors have also been investigated.