What do success rates depend on?

Pregnancy success rates depend on many factors, including some obvious ones (quality and number of embryos, age of woman, sperm quality, infertility cause) and some not so obvious (technological background of doctors, embryologists, nurses and other scientists implicated in the treatment, the setup and the quality control of the laboratory).

It is necessary to note that the age of the woman is the deciding factor for the success of the treatment. It is internationally accepted that increased age is related with statistically significantly lower pregnancy rates and births of healthy children.