In the Eppin trial that attained 100 % infertility and even among this small sample 2 monkeys were dropped from the study because they failed to produce sufficiently high antibody titers .
100 % infertility is a small sample size ( only 9 monkeys ) was used .
In the Eppin trial that attained 100 % infertility , a small sample size ( only 9 monkeys ) was used , and even among this small sample 2 monkeys were dropped from the study because they failed to produce sufficiently high antibody titers .