Women with insulin-treated diabetes are at significantly greater risk of preterm birth and of delivering babies who are large for gestational age (LGA), regardless of prepregnancy body weight, new findings suggest.
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Researchers examined the role of maternal diabetes and weight on pregnancy outcomes in the population-based cohort study. The study comprised 649,043 live births in Finland between Jan. 1, 2004, and Dec. 31, 2014, including 4,000 in women with insulin-treated diabetes, 3,740 in women with type 2 diabetes, and 98,568 women with gestational diabetes.
Prepregnancy body mass index was normal for nearly 60% of mothers, while 4% were underweight, 21% were overweight, 8% were moderately obese, and 4% were severely obese.
Overall, the researchers found that women with insulin-treated diabetes had a 43-fold higher odds of having an LGA infant, compared with the reference group of women of normal BMI without diabetes (adjusted odds ratio [aOR], 43.80; 95% confidence interval, 40.88-46.93). And there was an 11-fold greater odds of having a preterm birth in this group (aOR, 11.17; 95% CI, 10.46-11.93).
The findings were published in JAMA Pediatrics.
“Smaller, but clearly statistically significant, increased LGA risks were found also for mothers with type 2 diabetes and gestational diabetes not treated with insulin, especially in combination with prepregnancy overweight or obesity that were stronger for type 2 diabetes than gestational diabetes,” wrote Linghua Kong, MSc, of the department of molecular medicine and surgery at Karolinska Institutet, and coauthors.
The aOR for LGA among women with type 2 diabetes was 9.57 (95% CI, 8.65-10.58), compared with the reference group. And for women with maternal gestational diabetes, the aOR for LGA was 3.80 (95% CI, 3.66-3.96).