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The first pt.xpt dataset shows 22 constituents each as a single replicate (PTREPNUM=1), at one time point (PTTPT=Week 0 / PTTPTNUM=1) and from one set of storage conditions (STOCONID= Condition 1) in order to illustrate the variables and terminology required to construct an SDTM-conformant PT dataset for a stability study. Some constituent names (Values of PTTESTCD/PTTEST) appear twice because they are tested separately in both e-liquid and aerosol (as indicated by PTSPEC). Note that the constituent names shown do not represent an exhaustive list of the controlled terminology that will be developed to support representation of stability studies in SDTM.

• The use of SPDEVID and PTREFID in this example on records where PTSPEC=AEROSOL indicates that a smoking machine (shown in SPDEVID) was used to perform the smoking regimen (shown in PTREFID) to produce the aerosol from the e-liquid product on records where PTSPEC=AEROSOL. Details of the smoking machine and smoking regimen are not shown in this example. For examples illustrating how to represent these concepts in SDTM, see Section 3.1.3.1, Harmful and Potentially Harmful Constituents (HPHCs) and Smoking Regimens.
• STOCONID is used to identify the storage conditions of the e-liquid product for the testing performed. Details of these conditions are represented in the ES dataset example that follows the two PT dataset examples. 
• In this example, the applicant chose to sub-categorize some constituents using the permissible variable PTSCAT (Sub-Category of Test).