Data from 8,452 participants in the population-based Rotterdam Study found that, over eight years, 1,100 (13%) developed prediabetes and 798 (9.4%) developed diabetes. The risk of progressing from prediabetes to diabetes was up to 40% higher for those with low thyroid function. Even among those whose thyroid function was in the normal range at first measurement, progression from prediabetes to diabetes was 1.4 times higher for those in the lowest third of thyroid function levels compared with the highest third.
The average age of the participants was 65.
http://www.eurekalert.org/pub_releases/2016-04/tes-sll040116.php