Methods
INTER VENTIONS
The study was conducted in four central and northern English independent TV regions
(Central, Granada, Tyne Tees, and Yorkshire) between October 1992 and May 1994 (fig 1). No anti-smoking advertisements were shown by Central TV, which acted as the control region. In Granada, Tyne Tees, and part of Yorkshire the intervention comprised only the TV advertising campaign (TV media). In West Yorkshire the intervention comprised both the TV campaign and a local tobacco control net- work (TV media plus LTCN). Following the successful completion of the study phases of the campaign reported here the TV advertisements were shown nationally in all TV regions in England.