- Reaction score
- 26
From here : https://pubmed.ncbi.nlm.nih.gov/35107565/
Finasteride give +30 terminal hairs at 24 week :
Besides, at 36 weeks it’s +40! What a feat!
but total hair count is +11 :
Look at this reasoning:
- On average a standard guy has 100 hairs/cm2
- Terminal/vellus ratio averages 5:1
- A standard guy therefore has 80 terminals and 20 vellus per cm² on the scalp on average
- If this guy takes fina, according to the +30 from the study he gains +30 terminals
- Either a new total of hairs of 100 + 30 (the new terminals) + N, or N is the number of vellus gained because it also necessarily gains vellus...
- The gain is therefore 100+30+N/100 but we do not know N
- Unless we make the assumption of 5:1, in which case N = 130*20/100=26
- Which ultimately gives 26 vellus and 130 terminals
=> This guy therefore gained a total of 30 (terminals) + 26 (vellus) = 56 hairs, which is completely contradictory with the study which says that the guy should have gained +11 hairs in total...
Now, reasoning about the total hair:
- A standard guy therefore has 80 terminals and 20 vellus per cm² on the scalp on average
- If this guy takes the fina, his total number of hairs increases after 24 weeks to 111 hairs according to the previous study
- So, this guy has 111/5 = 22.2 vellus and 88.8 terminals
- That is 2.2 more vellus and 8.8 more terminals - which is much less illogical compared to the previous reasoning
But as I write these lines I realize that the guys should have also given the terminal/vellus ratio because without this data it is difficult to draw conclusions because this ratio must change with the end taking... no???
I just did a simulation with a guy who starts from 100 hairs/cm2 of the problem and I found that the two data are consistent only if the ratio is 1.6:
This would mean that alopecia would tend to reduce the ratio which normally is between 3-7 from what I have seen...
On the other hand, afterwards I told myself that a guy who loses his hair does not have 100/cm2 but rather 50 and the ratio obtained is 1.01:
So I don't really know what conclusion to draw but there is at least one point of consistency (ratio = 1) between the results given by counting the total number of hairs (+11) and the number of terminals (+30) ...
Apart from drawing the conclusion that the ratio in people with alopecia is 1 well I don't really see lol
If someone has an idea ...
Finasteride give +30 terminal hairs at 24 week :
Besides, at 36 weeks it’s +40! What a feat!
but total hair count is +11 :
Look at this reasoning:
- On average a standard guy has 100 hairs/cm2
- Terminal/vellus ratio averages 5:1
- A standard guy therefore has 80 terminals and 20 vellus per cm² on the scalp on average
- If this guy takes fina, according to the +30 from the study he gains +30 terminals
- Either a new total of hairs of 100 + 30 (the new terminals) + N, or N is the number of vellus gained because it also necessarily gains vellus...
- The gain is therefore 100+30+N/100 but we do not know N
- Unless we make the assumption of 5:1, in which case N = 130*20/100=26
- Which ultimately gives 26 vellus and 130 terminals
=> This guy therefore gained a total of 30 (terminals) + 26 (vellus) = 56 hairs, which is completely contradictory with the study which says that the guy should have gained +11 hairs in total...
Now, reasoning about the total hair:
- A standard guy therefore has 80 terminals and 20 vellus per cm² on the scalp on average
- If this guy takes the fina, his total number of hairs increases after 24 weeks to 111 hairs according to the previous study
- So, this guy has 111/5 = 22.2 vellus and 88.8 terminals
- That is 2.2 more vellus and 8.8 more terminals - which is much less illogical compared to the previous reasoning
But as I write these lines I realize that the guys should have also given the terminal/vellus ratio because without this data it is difficult to draw conclusions because this ratio must change with the end taking... no???
I just did a simulation with a guy who starts from 100 hairs/cm2 of the problem and I found that the two data are consistent only if the ratio is 1.6:
This would mean that alopecia would tend to reduce the ratio which normally is between 3-7 from what I have seen...
On the other hand, afterwards I told myself that a guy who loses his hair does not have 100/cm2 but rather 50 and the ratio obtained is 1.01:
So I don't really know what conclusion to draw but there is at least one point of consistency (ratio = 1) between the results given by counting the total number of hairs (+11) and the number of terminals (+30) ...
Apart from drawing the conclusion that the ratio in people with alopecia is 1 well I don't really see lol
If someone has an idea ...