A City Guide To Chengde for Therefore the aim of this study was to conduct a randomised trial of an intervention where BSE was either taught or not taught, and examine whether reduced breast cancer mortality could be found in those instructed in, and practising, BSE. Methods Participants A total of , women born between and working in textile factories across Shanghai were recruited in i.e. aged and over. Over , were subsequently excluded due to changes in their circumstances, mental or physical illness, refusal, death, omitted baseline questionnaire, or due to having a history of breast cancer , individuals. The final sample was therefore ,. Design Factories were randomised to being recruiting centres for either the intervention group IG or the control group CG; in this way participants were allocated to the IG and , to the CG. A City Guide To Chengde 2016.