There are 13 million abortions each year in China, according to research published in a Chinese national newspaper.

Researchers believe the real figure could be even higher because there are many abortions at unregistered clinics, the BBC reported.

Young single women are most likely to have abortions in a country where there are 20 million births each year.

China imposed strict family planning rules in the 1970s in an attempt to limit the growth of its population.

Many pregnant women who have had their full quota of children have abortions to prevent unwanted births. This research has been published by the China Daily newspaper.

Other Chinese media outlets have published similar figures, although it was not immediately clear when the research was carried out.

In a front-page story, China Daily said the high number of abortions was "cause for concern", adding that many women who have abortions are single and aged between 20 and 29.

China began restricting the number of children each couple can have in 1978. Officials say this has prevented 400 million extra births.

In many cases women are restricted to just one child, although in rural areas some couples can have two children if the first is a girl.

These rules mean abortions are used in some places to ensure the population growth is kept low.

Some women even complain that they are pressured into terminating their pregnancies.

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