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So, I repeated the above tests using an 80% and then a 60% efficiency – much more realistic in the real world. I call this the ‘effective kill rate’ or ‘EKR’.
The table below shows what percentage of follicles may be killed in various body areas using three EKRs – 100%, 80% and 60%. It clearly indicates that the number of repeat sessions depends greatly on the EKR – obviously!
Table 2 – Each session will kill a certain percentage of anagen follicles, depending on the EKR. This table shows the amount of follicles killed in each session.
So, for instance, let’s look at the upper lip. All the hairs can be killed in just two sessions, if a perfect 100% efficiency is achieved (which is most unlikely).
But, an 80% efficiency can achieve the same result after just four sessions. The first session will kill 46% of the hairs, while the second will kill 36% - obviously, after each treatment there are fewer follicles to kill every time! It’s a case of ‘diminishing returns’ at each treatment. The last two sessions will kill the final 18% of live follicles.
But, when we look at the 60% efficiency, we see that this requires a total of 6 sessions to achieve the end goal. A lower efficiency will require even more sessions.
Remember, only anagen follicles can be killed by using light energy. But the ‘best’ results occur when there are the maximum number of anagen follicles at the treatment time – the table above assumes this condition. If the maximum number of anagen follicles are not
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