1. Townsend score is calculated means that an electoral ward with an extremely poor estate at one end and affluent areas at the other would Figure 3 Scatter plot of standardised hospitalisation ratio for respiratory diseases it children under five years versus two year ambient NO2 levels in 39 electoral wards; in the give a Townsend score which does not adequately reflect the level of deprivation of West,1988
2. West Midlands Regional Health Authority. Partners in Health: Annual Report of the Regional Director of;Public Health,1992
3. Increase in hospital admissions for childhood asthma: trends in referral, severity and readmissions from 1970 to 1985 in a health region of the United Kingdom;Anderson, H.R.;Thorax,1989
4. National trends in morbidity and mortality of asthma in the US - prevalence, hospitalisation and death from asthma over two decades 1965-1984;Evans, R.; Mullally, D.I.; Wilson, R.W.; Gergen, P.J.; Rosenberg, H.M.; Grauman, J.S.;Chest,1987
5. Changes in asthma prevalence: two surveys 15 years apart;Burr, M.L.; Butland, M.K.; King, S.; Vaughan-Wiliams, E.;Arch Dis Child,1989