Puff Topogaphy

This is a study were subjects were randomized to use 3 different concentration of e-nicotine liquid. The subject used the product at home for 2 weeks. This 2-week period allowed subjects to become familiar with the e-cigarette. After two weeks, the subjects were confined to the clinical for one day. They were required to not use any  e-cigarettes for 12 hours prior to the visit. Subjects had to have CO level below a pre-specified level, to attend the visit.  If the level, was too high, the visit was re-scheduled. Subjects were instructed to take 10 puffs on the e-cigarette. Puff topography was measured using the same device for all subjects. 

A  Study Reference domain, DI, was used to identify the device used to measure puff topography.  The provide a consistent sponsor-defined variable (SPDEVID) for linking data. Device identifiers exist independently from subjects; therefore, the DI domain does not contain USUBJID. Only one device was used for all subjects in the study. 

The sponsor submitted the EX domain to represent the usage of the e-cigarettes. For each subject, the usage for the two weeks are represented, and then the specified usage during the in-clinic visit are shown.    

   

The FAEX domain was used to represent the puff topography associated with the in -clinic visit.  A puff -by puff analysis was performed. Additionally , the vendor provided the mean puff volume and the mean puff duration for the 10 puffs in the session.    The RELREC dataset was used to record the relationship between the Exposure records in EX and the records in FAEX.