"These findings should reassure women that emotional distress caused by fertility problems or other life events co-occurring with treatment will not compromise their chance of becoming pregnant," said Jacky Boivin of Cardiff University's school of psychology, who led the study.
Infertility is a worldwide problem that affects 9 to 15% of the childbearing population, experts say. More than half of those affected will seek medical advice in the hope of eventually being able to become a parent.
Many infertile women believe that emotional distress is a factor in not getting pregnant naturally or in lack of success with fertility treatment.
But Boivin's team, whose work was published in the British Medical Journal, said that view was largely based on anecdotal evidence and often repeated fertility myths such as "relax and you'll get pregnant."
Conducting a large-scale review known as a meta-analysis, the researchers looked at data from 14 studies involving 3,583 infertile women from the United States, Australia, Britain Belgium, Canada, Denmark, Sweden, Turkey, and other countries who were undergoing fertility treatment.
The women had been assessed for anxiety and stress before their treatment, and Boivin's team compared data for women who achieved pregnancy to those who did not.
The results showed emotional distress was not associated with whether or not a woman became pregnant, Boivin said.
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