Figure 1From: Informal knowledge transfer in the period before formal health education programmes: case studies of mass media coverage of HIV and SIDS in England and Walesa) Estimated incidence and upper and lower 95% uncertainty range (Bayesian methods) of HIV infection in homosexual and bisexual men, England and Wales, 1979–1990; b) Ratios of deaths attributed to SIDS per 1000 live births, England and Wales, 1981–1994. 1a) Sources: Incidence estimates [35], timing of campaign [36]. 1b) Sources: Deaths [OPCS], timing of 'Back to sleep' [December 1991].Back to article page