Re: spring 2004 wise traditions mag - pearl index calculation

[Guest guest]

The pearl index is about 100 women doing one kind of birthcontrol for

1 year.

(number of women who got preg x number of month (12)) divided by

(number of months (12)x number of women) x 100

example: 100 women took part, 2 got pregnant, obviously 2 %, so it's a

pearl index of 2

(2x12) divided by (12x100) x 100 = (24 divided by 1200) x 100 = 0.02 x

100 = 2

CU Anja

--- In , Busse <laurabusse@j...>

wrote:

> the success rate is never 100% even if it's 99% that means that one out

> of one hundred times will produce a pregnancy. for a million people,

> just having sex one time each using that method, would produce ten

> thousand pregnancies!

>