Published online by Cambridge University Press: 31 July 2008
As the participants in the 1958 National Child Development Study cohort enter adulthood most of the social factors associated with onset of asthma are no longer relevant, but many of the biological factors continue to be important. There is a continuing association at age 23 between eczema, hayfever and similar allergic reactions and continuing asthma, while the earlier associated social factors including non-manual occupations, home ownership, and lack of crowding within the home or sharing of the bedroom with others in the household cease to have significant effects. Smoking patterns in this age group diverge sharply from what might be expected in those with a serious respiratory affliction: significantly more asthmatics smoke than would be expected at random.