long half-life and large variability [Regulatives / Guidelines]

posted by ElMaestro  – Denmark, 2020-07-30 10:17 (1308 d 10:01 ago) – Posting: # 21802
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Hi mrtin,

❝ There are two types of covariates (type 1: continous = subject specfic values; and type 2: categorical variable with a few levels).


Type 2 sounds like the very thing that I would call a fixed factor. :-)

❝ At the first glance a different regulatory pathway might be worth considering based on a PK or exposure similarity evalulation as in such a case there could be more flexibility regarding acceptance of statistical models used to test for equivalence in PK metrics.


❝ Happy to get your thoughts on this idea.


I would always recommend to approach regulators for a discussion. They will always listen but not always agree.

Injectable? Sometimes surface area or body weight is reasonable for exposure modeling. That's a covariate in the word's best sense :-) As in, a continuous variable. If multiple periods or longitudinal study, a covariates like bw may change over time.

Pass or fail!
ElMaestro

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