Now, maths to help predict a woman's chances of conceiving
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Scientists claim to have developed a new mathematical model which can help predict a couple's chances of becoming pregnant, on the basis of how long they have been trying.
The new study by University of Warwick and the London School of Economics may also shed light on how long the couples should wait before seeking medical help.
Researchers found that, if the woman is aged 35, after just six months of trying, her chance of getting pregnant in the next cycle is then less than 10 per cent.
The analysis uses the number of menstrual cycles over which the couple has been trying for a baby to determine a probability of conception within the next month.
"After several cycles without pregnancy, it becomes relatively more likely that a couple have low fertility. This is the main reason why it becomes less likely that conception will occur in the next cycle," said Dr Peter Sozou of the London School of Economics.
"Many couples are not aware that chance plays a big role in getting pregnant. People expect to get pregnant when they want to, so finding out that it isn't happening can be a shock," Professor Geraldine Hartshorne of Warwick Medical School said in a statement.
"Approaching a doctor about such a personal matter is daunting so knowing when is the right time to start investigations would be a useful step forward.
"We can't work out exactly when, or if, a woman will become pregnant - but this analysis can predict her chances, and give a percentage estimate of pregnancy in the next cycle," Hartshorne said in a statement.
When a woman is 25, it takes 13 menstrual periods before her chance of pregnancy in each new cycle has declined to below 10 per cent, according to the model.
The number of months required to reach a conception chance below 10 per cent cycle is 10 at age 30, and just six at age 35.
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