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Age is very important with regard to the success of fertility treatment so when considering success rates, take into account the age of the women treated. The HFEA website shows the results for different treatments in various age groups, breaking it down into women below 35 years, those aged 35-37 years, those aged 38-39 years, and, those aged 40-42 years of age.

Assisted conception success rates can also be gauged according to what part of the treatment process it is based on. For example, is the live birth rate based on the number of treatment cycles, the number of egg collections or the number of embryo transfers? The live birth rate is lower if it is based on cycles started rather than embryo transfers as not all treatment cycles lead to an egg collection. Sometimes the cycle has to be abandoned if the ovaries do not respond and too few or too many eggs develop.