Parents who have five or more children may face a higher risk of heart disease than those who have only one or two, a recent study suggests. As part of the study, a team of researchers looked at data from nearly 25,000 participants, aged 50 and older, who took part in a national health survey. The findings have been published in the Journal of Aging and Health. "Many studies have linked women's reproductive characteristics, such as their age at their first childbirth, with their risk of heart disease later in life. But there wasn't much known about the association between family size and heart disease, and very few studies have looked at how fatherhood may relate to men's risk of heart disease," said Sara Hipp, lead researcher of the study. The team of researchers found that 30 per cent of the parents who said they had five or more children had a heart condition such as coronary heart disease, angina or congestive heart failure. Just 22 per cent of those who had only one or two children, and 21 per cent of those who had no children, said they had been diagnosed with a heart condition.