(HealthDay News) − Women with gestational diabetes mellitus (GDM) who are obese have significantly higher odds of adverse pregnancy outcomes.

To determine associations of GDM and obesity with adverse outcomes, Patrick M. Catalano, MD, of Case Western Reserve University at MetroHealth Medical Center in Cleveland, and associates analyzed HAPO data on 23,316 women (average age, 29.2 years) from 15 centers in nine countries who took a 75g oral glucose tolerance test (OGTT) between 24 and 32 weeks of pregnancy.

The researchers found that obesity, defined as body mass index (BMI) ≥33kg/m², and GDM were diagnosed in 13.7 and 16.1% of participants, respectively, with an odds ratio (OR) of 2.19 for birth weight greater than 90th percentile for GDM alone, compared with obesity alone (OR, 1.73) and GDM and obesity combined (OR, 3.62). The data showed that women with higher OGTT glucose and maternal BMI had significantly higher odds for newborn body fat, cord serum C-peptide, and birth weight greater than 90th percentile compared to normal/underweight women (64.2% of participants) with normal glucose.

“Both maternal GDM and obesity are independently associated with adverse pregnancy outcomes,” the authors write. “Their combination has a greater impact than either one alone.”

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