Comparison of cost for each screening strategy of FPG test combined with further OGTT test at different FPG cut-off points.

aThe cut-off point of 6.1 mmol/L was added, because it is the FPG threshold for diagnosing Impaired Fasting Glycaemia (IFG).bSubjects with previous diabetes diagnosis, and another 170 cases with FPG in the interval [5.0, 7.0) but without further OGTT test were excluded from this analysis.cFor those cases with FPG in the interval [0, 5.0), no further OGTT test was conducted in this study.dAccording to the mathematical modeling, a total of 65 undiagnosed diabetes cases were supposed to be identified by further OGTT test after FPG test among the cases.