A natural family planning method is as effective as the contraceptive pill, German research suggests.

The symptothermal method (STM) assesses fertility levels during the monthly cycle by measuring body temperature, and observing cervical secretions.

The Human Reproduction study found using STM correctly led to a rate of 0.4 pregnancies per 100 women per year.

UK experts said natural family planning was effective - provided it was taught properly and carried out correctly.

A University of Heidelberg team assessed STM in a study of 900 women.

The lowest pregnancy rate was found among women who abstained from sex during their most fertile period, as defined by STM.

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BBC NEWS | Health | Natural contraception 'effective'