Triplet births rising and death rates high

Triplet births are on the increase, even when IVF pregnancies are discounted, and the death rate for triplets is 10 times higher than for single births, Norwegian researchers said yesterday.

The researchers, who said their findings were likely to be similar in other parts of Europe, said the increase in triplet pregnancies was probably due to use of hormone drugs to stimulate ovulation and a rise in the average age of mothers.

The results mean more effort is needed to control such treatments to cut the number of triplet pregnancies, they said.

The study analysed more than two million pregnancies between 1967 and 2006 in Norway and found that although death rates have fallen for singles, twins and triplets in the past 40 years, the rate for triplets is still 10 times higher than for single births.

"Advances in obstetric practice and perinatal care have increased the survival of very preterm infants," said Anne Tandberg of the Haukeland University Hospital in Bergen, who worked on the study. "However ... the improvements have not been so favourable for triplets compared to twins and singletons."

Dr Tandberg said that although the study excluded births after in-vitro fertilisation - which invol-ves eggs being fertilised in a laboratory dish and the embryos being implanted into the mother - the underlying triplet rate was still rising.

At about 2.7 per 10,000 pregnancies between 2002 and 2006, the rate of triplet pregnancies is almost two-and-a-half times higher than it was in the 1970s, the study found.