BMJ  2008;336:1039 (10 May), doi:10.1136/bmj.39569.628866.DB

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Prevalence of pre-existing diabetes in pregnancy doubled in seven years in a Californian population

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The prevalence of pre-existing diabetes in pregnancy doubled during the seven years from 1999 to 2005 in a large study of an ethnically diverse population in California (Diabetes Care 2008;899-904; doi: 10.2337/dc07-2345).

Prevalence doubled for women aged 20-39 years and increased fivefold for teenagers in that time. Women aged 40 or more had a small but significant increase in prevalence of pre-existing diabetes. The increase among younger women was said possibly to reflect either an increasing prevalence of diabetes or an earlier age at diagnosis.

The study comprised 175 249 women aged 13-58 years who had 209 287 single pregnancies of at least 20 weeks’ gestation during the study period in all Kaiser Permanente programme hospitals in southern California. Information from clinical databases and birth certificates was used to estimate the presence of two broad categories of diabetes—pre-existing type 1 or type 2 diabetes and gestational diabetes mellitus.

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