28 May 2015
Researchers at the University of Nottingham have confirmed that pills containing one of the newer types of progestogen hormone can increase a person's risk of blood clots.
Around nine per cent of women of reproductive age worldwide use oral contraceptives, while some 28 per cent use them in the UK.
Led by Yana Vinogradova, research fellow in Medical Statistics at the University of Nottingham, the study tried to address the fact that different methods are often used to link oral contraceptives and blood clot risk.
The team used prescription data from two large UK general practice databases to measure the associations between use of combined oral contraceptives and risk of blood clots in women between 15 and 49 years old.
After adjusting for other known risk factors, they found that current users of any combined oral contraceptive are at an increased risk, compared with non-users of similar age and health status.
The researchers say this is "an important clarifying study" that "has sufficient power to provide reliable comparative findings for different formulations of combined oral contraceptives".
Posted by Jeanette Royston
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