Final answer:
About 30 percent of infertility cases in couples are due to female factors, with the same percentage attributing to male factors. Factors that may increase the risk of female infertility include lifestyle choices and age, with the success of treatments like IVF being heavily dependent on the woman's age.
Step-by-step explanation:
The percentage of infertility factors that are female-related is about 30 percent. Similarly, another 30 percent of infertility in couples is due to male infertility. The remaining 40 percent can be attributed to problems in both partners or to unknown causes.Female infertility can be influenced by various risk factors such as tobacco smoking, excessive alcohol use, stress, poor diet, extreme sports training, and being either overweight or underweight. Age also plays a significant role, as female fertility peaks in the mid-twenties and starts to decline after the age of 30.
Regarding treatment, in vitro fertilization (IVF) is one of the options available, with its success rate correlated to the woman's age. For instance, the rate of giving birth following IVF is over 40 percent for women under 35, which significantly diminishes to just above 10 percent for women over 40.