The research sought to describe the nature and severity of disability and its impact in a large sample of 18-year-olds. It was conducted as part of a larger longitudinal study of the health and development of a cohort of approximately 1000 children. This paper presents an overview of the methods used together with the results on the prevalence of specific disabilities. The three leading disabilities were: coping with dust, pollens, or chemicals (rate: 272 per 1000), equipment dependence (186), and disability in endurance (160).