Table 2—

Mean plasma glucose levels (SD) of measurements obtained during the screening and diagnostic tests for GDM by age (KPMCP of Northern California, 1996)

Age (years)
P linear trendAll
< 2525–2930–3435+
Screening (50-g, 1-h OGTT)7,4737,6227,2254,16126,481
Plasma glucose mmol/l
 1-h6.0 (1.4)6.4 (1.5)6.6 (1.7)6.9 (1.8)<0.0016.4 (1.6)
Diagnostic (100-g, 3-h OGTT)6601,1611,4089964,225
Plasma glucose mmol/l
 Fasting4.6 (0.8)4.6 (0.7)4.7 (0.7)4.7 (0.6)<0.0014.6 (0.7)
 1-h8.6 (1.9)9.0 (1.9)9.2 (1.9)9.3 (1.8)<0.0019.1 (1.9)
 2-h7.5 (1.8)7.9 (1.9)8.1 (1.9)8.3 (1.8)<0.0018.0 (1.9)
 3-h6.2 (1.7)6.4 (1.7)6.4 (1.9)6.4 (1.8)0.035*6.4 (1.8)
  • Data are n or means (SD).

  • *

    * P value for linear and quadratic term.