At baseline,fasting glucose concentrations were related to age(r = 0.651, p = 0.01) and A1c (r = 0.647, p = 0.01), and fasting glucose concentrations and A1c were elevated in the participants diagnosed with prediabetes compared to the other participants (6.93 ± 0.43 versus 5.67 ± 0.28 mmol/l, p = 0.04 and 6.0 ± 0.1 versus 5.2 ± 0.1%, p = 0.003).