BMJ  2006;332 (22 April), doi:10.1136/bmj.332.7547.0-b

Preterm births have risen in Denmark in low risk women

The rate of spontaneous preterm births in low risk primiparous women increased by 51% from 1995 to 2004 in Denmark, while the increase in all pregnant women was only 22%. Langhoff-Roos and colleagues (p 937) assessed 99.8% of deliveries over the nine years and found that primiparity and multiple birth were the most important risk factors for preterm birth. The reason for the disproportionate increase in low risk women is unclear, but using these authors' criteria to identify standard populations of primiparous women at low risk in other countries will make international comparisons of preterm delivery rates possible.

Credit: TINA STALLARD/SPL

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