But the short duration of the study means it may not be able to answer some important safety questions.

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Of those who were living together when the study began, the average duration of their unions at that point was more than eight years.

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Consequently, our study challenges current guidelines on the duration of antithrombotic treatment after AVR surgery with biological valves by presenting results suggesting that these patients will gain from an additional 3 months of warfarin treatment in terms of reduced cardiovascular death without risking a significant increase in bleeding events.

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Moreover, the Durham University study also found a link between the duration of breastfeeding and the growth of the brain after birth, causing researcher Barton to suggest two years of breastfeeding may lead to increased cognitive functioning.

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The study found little difference in the severity and duration of symptoms reported between groups.

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To account for the sleep variable, researchers in this study kept close tabs on the duration and quality of sleep of the participants.

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