Figure 4

Flow of subjects and saliva samples through the trial. N, number of subjects; n, number of saliva samples; CV, coefficient of variation. Saliva samples were collected twice per person every 2 weeks during the 12 week period. "Affecting drug" means that the drug, such as an antihistamine, potentially affects saliva secretion. "Absence" means that the subject could not participate on the day of saliva collection due to miscellaneous reasons. "No saliva" means that the subject was present but failed to provide a saliva sample.