When comparing outcomes of various infertility treatments, we must make allowance for a variety of confounding factors. Couples seeking infertility treatment are likely to be slightly older and this confers a negative bias. Those who follow all possible treatment options including IVF tend to be educated and of higher socio-economic status and these confer a more positive influence. Treatment regimens using ovulation induction drugs and particularly gonadotrophins, are more likely to result in multiple pregnancy resulting in a higher birth rate but greater obstetric (childbirth) risks.

Results reported from individual departments are more likely to be from pioneers or those achieving the best results. National statistics and meta-analyses (Q33.23) indicate a more appropriate reflection of the situation. Treatment advances are occurring so frequently that trends are difficult to interpret. Intracytoplasmic sperm injection (ICSI -25), for example, has resulted in a fall in donor insemination treatment cycles.


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