About numbers and percentages in hair-related studies.

[sphlanx2006]

There is a discussion about the confusion caused by Intercytex interim results concerning % percentages of hair growth.
Many were dissapointed but it is not just Intercytex that announces results this way.
All the hair-related studies (like the one of Neoshil etc etc) announce the result this way.
But in fact, 10% or 100% tell us nothing about the actual efficacy of each treatment. 100% regrowth is actually nothing if the treatment was placed over an area, with a total of 5 hair(complete bald) in it. On the other hand the same regrowth percentage(100%) would mean a LOT, if the treatment was placed over an area OF THE SAME SIZE, but with 300 hair(diffuse) resulting in 300 new hair doubling the density and providing a decent visual result.

So please, IF anyone here has some more information about how this percentages work and what exactly do they mean, please post it. It would explain A LOT.

 

[Bryan]

I would be surprised if any legitimate study used the term "100% regrowth" (or some other percentage of regrowth) in a description of their results, for the reason you mention. I don't recall ever seeing that expression used in any of the hundreds of studies I've read. I think you must be misrepresenting what they said.

 

[abcdefg]

Wasnt the results of some hair multiplication study supposed to be announced on september 25th or so? i havent seen any posts on how it went

 

[sphlanx2006]

I would be surprised if any legitimate study used the term "100% regrowth" (or some other percentage of regrowth) in a description of their results, for the reason you mention. I don't recall ever seeing that expression used in any of the hundreds of studies I've read. I think you must be misrepresenting what they said.

I understant your objection but this doesnt change the point of my message which is that many many people do not understand what percentages and numbers in hair studies mean.

To quote intercytex result:

In the second sub-group (5 patients in total) injected more recently,
all patients showed substantial and visible increased hair counts at 6 and/or 12 weeks (13-105%).

So they say increased hair counts (13%-105%). Bryan you seem to have a lot of experience in reading and understanding studies related to hair loss, so if you have any idea what does this mean please share it

 

[Bryan]

It's pretty obvious what they mean, isn't it? If a haircount went from 100 to 150, then that would be a 50% increase in the haircount.

It would be more ambiguous to say that "there was 50% regrowth", because that doesn't precisely specify exactly what they mean.