Prevalence of gestational diabetes diagnosed by the 1999 WHO criteria and the IADPSG criteria.

Abbreviations: WHO, World Health Organization; IADPSG, International Association of Diabetes and Pregnancy Study Group; GCT, glucose challenge test; OGTT, oral glucose tolerance test.
* 40 women with GCT<7.8 mmol/L were referred to have OGTT because they had GCT before the 19th gestational week and meanwhile had a family history of diabetes.
† The total sample size of 17808 women was used as the denominator in calculation of the prevalence.
†† The total sample size of 18589 women was used as the denominator in calculation of the prevalence.
Prevalence of gestational diabetes diagnosed by the 1999 WHO criteria and the IADPSG criteria.