Prevalence of infertility varies depending on the definition, i.e. on the time span involved in the failure to conceive. *Infertility rates have increased by 4% since the 1980s, mostly from problems with fecundity due to an increase in age. *Fertility problems affect one in seven couples in the UK. Most couples (about 84%) who have regular sexual intercourse (that is, every two to three days) and who do not use contraception get pregnant within a year. About 92 out of 100 couples who are trying to get pregnant do so within two years. * Women become less fertile as they get older. For women aged 35, about 94% who have regular unprotected sexual intercourse get pregnant after three years of trying. For women aged 38, however, only about 77%. The effect of age upon men's fertility is less clear. * In people going forward for IVF in the UK, roughly half of fertility problems with a diagnosed cause are due to problems with the man, and about half due to problems with the woman. However, about one in five cases of infertility have no clear diagnosed cause. *In Britain, male factor infertility accounts for 25% of infertile couples, while 25% remain unexplained. 50% are female causes with 25% being due to anovulation and 25% tubal problems/other. *In Sweden, approximately 10% of couples wanting children are infertile. In approximately one-third of these cases the man is the factor, in one third the woman is the factor, and in the remaining third the infertility is a product of factors on both parts.
symptoms of Mulibrey nanism
symptom of Mulibrey nanism
symptom of Botulism
symptom of Japanese encephalitis
symptom of Rabies
symptom of Eastern equine encephalitis
symptom of Scabies
symptom of Lead poisoning