1- consumers' perception of the value of salesmen's presentations,
2- the ability of salesmen to provide balanced information to consumers,
3-the ability of salesmen to provide good methodological quality and relevance evidence to substantiate/ support their claims,
4- consumers' perception of the accuracy of the main claim made by salesmen,
5- the conformance of salesmen's activities with the code of conducts.
You could think about using a gender-neutral term like 'sales representatives'.