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Evidence-based GLP-1 & peptide discussion since 2023
ForumsClinical Trials & ResearchHas anyone dealt with trial endpoint primer?

Has anyone dealt with trial endpoint primer?

BariatricNurseD Sun, Dec 28, 2025 at 4:35 AM 7 replies 1,032 viewsPage 1 of 2
BariatricNurseD
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Dec 28, 2025 at 4:35 AM#1

This is the version of the explanation I wish somebody had given me, written down before I forget what confused me. It is about the trial evidence, and it is deliberately narrow — everything I am not confident about is marked as such.

What is actually established

Relative and absolute effects need reading together. A 20% relative reduction on a high baseline risk is a large absolute benefit; the same relative figure on a low baseline risk is a small one, and press summaries almost always quote the relative number because it is bigger.

The condition it depends on

Subgroup analyses deserve particular suspicion. With enough subgroups something is significant by chance, and pre-registered subgroups are a different animal from ones found afterwards.

The practical version

A quick sanity check on any figure quoted here: is it mean or median, is it intention-to-treat or completers, and what was the comparator. Three questions, and they resolve most disagreements in these threads.

What I am not sure about

The question I want answered is how to read a result like this without either dismissing it or over-reading it, since the summaries all read like press releases. Tell me what I have not thought of.

— BariatricNurseD · corrections welcome and will be edited into this post with credit
17 20tony_orlando, Dr.NephBHM_UK, kim_atl_prep and 14 others
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Dr.SleepRoch
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Dec 28, 2025 at 5:01 AM#2
BariatricNurseD said:
Relative and absolute effects need reading together.

That is correct as far as it goes, and here is where it stops going. The gap between trial results and real-world results is consistent and it is not fraud. Trial participants get titration by protocol, scheduled contact, free drug and dietetic support; removing that infrastructure costs a few percentage points every time it has been measured. When your own curve sits below the published mean, that is the likeliest explanation before anything about you or your material.

Last edited: Dec 28, 2025 at 9:01 AM
18 21kim_atl_prep, sarah_TO, wendy_avl and 15 others
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kate.chem
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Dec 28, 2025 at 5:27 AM#3
BariatricNurseD said:
Relative and absolute effects need reading together.

Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. I would add the less popular caveat: these trial populations under-represented several groups, older adults and the highest BMI categories among them. The results probably generalise, and "probably" should be stated as an assumption rather than dropped.

19 22tyler_CSCS, VanRx_Mike, steve_okc and 16 others
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Dr.PeteFamMed
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Dec 28, 2025 at 5:53 AM#4

Short answer first, then the reasoning. Read four things before the headline number. The population, because trial populations are selected and supported in ways that real cohorts are not. The comparator, because "better than placebo" and "better than the current standard" are different claims and get reported identically. The primary endpoint as pre-registered, because a secondary endpoint promoted after the fact is a hypothesis rather than a finding. And the completion rate, because a large effect in the half of participants who finished is a different result from a large effect in everybody enrolled.

Last edited: Dec 28, 2025 at 6:53 AM
20 23Dr.BariatricHTX, LindaRN_retired, tommy_boulder and 17 others
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greg_boulder
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Dec 28, 2025 at 8:16 AM#5
Dr.SleepRoch said:
The gap between trial results and real-world results is consistent and it is not fraud.

This is my experience too, for whatever a second data point is worth.

Last edited: Dec 28, 2025 at 10:16 AM
21 24ben_calgary, patPC_UT, Dr.DermMIA and 18 others
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