However, no large scale study of GDM among Thai pregnant women has been done. Several hospital-based studies attempted to get estimates of GDM, especially among pregnant women who were defined as having high risk pregnancies. The incidence of GDM
reported in various studies ranged from 2 to 7% of total pregnancies, or from 5 to 20% of pregnant women who were classified as having a high risk pregnancy or who were positive based on a glucose challenge test.
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Studies differed in terms of the definitions used for high risk
pregnancy and in the types of screening tests used for
defining GDM. A cohort study in a hospital in northern
Thailand reported that 3% of pregnant women had GDM.
A follow up of these women after delivery showed there
was a 3.7% probability of developing type 2 diabetes at 9
months, and an 18.9% probability of developing diabetes
after 9 years.
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