Adult observers were responsible for the supervision of minors as well as for the collection of data relating to the posting of signs consistent with the tobacco laws and for the gathering of information relating to the availability of tobacco advertising at point of sale. [...] The core twenty-five cities that have been part of these surveys since the beginning remained intact, and the distribution of the sample in these cities by trade class, and age and gender of minors was held as consistent as possible within the limits of a changing marketplace. [...] Among these are: store location near or away from schools or malls, the time of day stores were visited and the presence or not of other adults in the store at the time of the intended purchase. [...] Retailer Compliance with Mandatory Sign Provisions – 2003 How To Interpret This Table The figures in the column labeled Full Compliance indicate those retailers properly posting every required sign in the region shown and, in the case of the national figure, across all regions in the country. [...] The figures in the other columns show the percentage of retailers properly posting the sign indicated at the top of the column.