The aim of this study was to assess the frequency of gestational diabe
tes mellitus (GDM) using an oral glucose tolerance test (OGTT) in preg
nant women with positive screening glucose challenge test (GCT). A gro
up of non-diabetic women of the Vicenza Health District (n=1014), aged
18-47 years (mean 29+/-4.6, SD) was examined, GCT and OGTT results we
re also evaluated in relation to risk factors, GCT positive results we
re 12%, while GDM positive results were 3.9%. By using either chi squa
red test corrected by Yates formula or the Fisher test for univariate
analysis, a significant relationship between een GCT and pre-pregnant
body mass index (BMI) and between GCT and women age was noticed, No re
lation between risk factors and GDM was found.