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Table 4 Prevalence of GDM by season. Prevalence of GDM with 1-h and 2-h post-OGTT VPG values excludes those with an abnormal fasting value

From: Seasonality, temperature and pregnancy oral glucose tolerance test results in Australia

 Summer (%) n = 476Autumn (%) n = 530Winter (%) n = 558Spring (%) n = 558p value
GDM prevalence by fasting plasma glucose ≥5.1 mmol/L n = 795.5%6.4%9.5%8.4%= 0.055
GDM prevalence by 1-h post-load glucose ≥10.0 mmol/L n = 316.5%3.6%2.5%3.2%= 0.009
GDM prevalence by 2-h post-load glucose ≥8.5 mmol/L n = 124.2%3.2%1.6%4.7%= 0.033
Overall GDM prevalence by WHO criteria
n = 122
13.9%12.1%12.9%15.1%= 0.510
  1. Data represented as %