PHX/WNL 8.0 vs. previous releases [🇷 for BE/BA]

posted by Helmut Homepage – Vienna, Austria, 2017-10-29 01:20 (2454 d 03:35 ago) – Posting: # 17939
Views: 23,662

Hi Astea,

❝ Can anyone please suggest me an easy way of calculation T50% early and late, T75%, T90% and similar parameters via Phoenix?


Maybe later. ;-)

❝ By the way, in this old thread as well as in this it was written that Phoenix approximates the decreasing part with log-transformation independetly of the rule choosen for AUC.


Although not described in the User’s Guide, correct.

❝ Now it seemed to be changed, and the actual form of approximation depends on the rule for AUC, so it can be linear as well as log-linear.


Correct since the current release v8.0 (formulas (6) and (7) on p53 of the User’s Guide).

❝ But this is not true for partial area calculation: for example, AUC0-72 for subjects with missing t=72 value, Phoenix always do log interpolation even if we've choosen linear AUC calculation.


Like in previous versions (though I didn’t check it)-

❝ I am also puzzled why for the following dataset we get TimeLow=18 if Lower limit is choosen to be 3? Because if we substract 4 from all time points we'll get 16... (linear interpolation was selected)

 t | C

---+---

 4 | 6

 6 | 4

 8 | 3

10 | 2

12 | 0

24 | 0


Since your data set doesn’t contain a concentration at t=0, it is extrapolated (see the core output). The method depends on the Dose Options. For Extravascular we get C=0 and for IV Bolus C=13.5. Then I got these results for TimeLow in the releases of Phoenix/WinNonlin I have on my machine:

Dose Options  6.3  6.4  7.0  8.0
Extravascular  28   28   28   18
IV Bolus       31   31   31   16

I will explore it further…

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