Prevalence of gestational diabetes mellitus and gestational impaired glucose tolerance in pregnant women evaluated by National Diabetes Data Group and Carpenter and Coustan criteria

ObjectiveTo determine the prevalence of gestational diabetes mellitus (GDM) and gestational impaired glucose tolerance (GIGT) using National Diabetes Data Group (NDDG), and Carpenter and Coustan (CC) criteria.MethodRetrospective study of the prevalence of GDM and GIGT in 21 531 pregnant women screened for GDM between 2005 and 2007 using NDDG and CC criteria. Linear trends in prevalence of GDM and GIGT by age were calculated using logistic regression.ResultsMean prevalence rates for GDM were 3.17% (95% CI, 3.05–3.29; n = 683) and 4.48% (95% CI, 4.36–4.6; n = 964) according to NDDG and CC criteria, respectively. Mean prevalence rates for GIGT were 1.97% (95% CI, 1.85–2.09; n = 426) and 2.46% (95% CI, 2.34–2.58; n = 529) according to NDDG and CC criteria, respectively. Prevalence of GDM and GIGT increased with increasing age with both criteria (P < 0.001). The prevalence of GDM increased by 41.1% and GIGT increased by 24.2% using the CC criteria compared with the NDDG criteria.ConclusionThe prevalence of GDM and GIGT was higher when CC criteria were used compared with NDDG criteria, particularly in younger age groups. The prevalence of both GIGT and GDM increased with increasing age with both criteria.