Adverse event (AE) is any untoward medical occurrence including:
* undesirable signs & symptoms
* disease or accidents
* abnormal lab finding (leading to dose reduction/discontinuation/intervention)
TEA treatment-emergent adverse event (TEAE) is defined as any event not present prior to the initiation of the treatments or any event already present that worsens in either intensity or frequency following exposure to the treatments.
AE is typically collected after signing the informed consent form and could be related or unrelated to the study drug. TEAE is for after the subject actually taking the study drug. That is why the number of AE and number of TEAE are not the same (usually AE includes TEAE).
Since the starting point for AE collection is the signing of the informed consent, not the start of the study treatment, there are some adverse events occurred prior to the initiation of the study treatment. These AEs may be called “baseline-emergent adverse event” which defined as any event which occurs or worsens during the staged screening process (after informed consent) including the randomization visit. It is common to have separate summaries for AEs occurred prior to the initiation of the treatment and AEs occurred after the initiation of the treatment (ie, summary of treatment emergent adverse events).