Laura Carreiras
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Portugal,
2024-02-16 16:05
(56 d 00:28 ago)

Posting: # 23866
Views: 763
 

 Tmax guideline [Regulatives / Guidelines]

Hello,

I know this topic was already discussed here but I am not clarified.

Regarding the Tmax in the guideline:

90% confidence interval: 80.00–125.00% for AUC0-72h and Cmax. Comparable median (≤ 20% difference, 80.00–125.00%) and range for Tmax

What do you think is the best statistical analysis to analyse Tmax? Hodges-Lehmann Estimate for example?

Thank you so much for the help!
Helmut
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Vienna, Austria,
2024-02-16 16:59
(55 d 23:34 ago)

@ Laura Carreiras
Posting: # 23867
Views: 639
 

 The minefield…

Hi Laura,

❝ I know this topic was already discussed here but I am not clarified.

You are not alone…

❝ What do you think is the best statistical analysis to analyse Tmax? Hodges-Lehmann Estimate for example?

Some stuff to chew (not to say to digest):The last one is pretty technical, I must confess, and it was written before the EMA’s product-specific guidances were finalized.
Personally I’m happy with nonparametric methods. They were recommended for ages till 2010 in Europe and still are in some other jurisdictions. I used them in hundreds of my studies. IMHO, it would only make sense if you define a priori a clinically not relevant range and assess the ≈90% CI for inclusion. This range should be defined case by case and not based on this crappy 20% of the median as the EMA stated. As shown in the presentations of Jiří and myself it would require an extremely tight sampling schedule. Furthermore: You might have different ranges dependent on the indication. Think about paracetamol: The range might be narrow as an analgesic, but is completely irrelevant if administered in multiple doses as an antipyretic in children.
There will be an entire session dealing with early exposure at the 6th GBHI workshop (Rockville, 16–17 April 2024).

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