SLC30A8 and diabetes mellitus: Whilst it is difficult to compare between cross-sectional studies, where ZnT8A testing is often omitted, where GADA/IA-2A/ZnT8 was tested >10 years diabetes duration, there is agreement that autoantibody prevalence decreases with diabetes duration, but different frequencies of all biochemical autoantibodies were reported [12, 19, 20], and these studies were unable to account for baseline positivity status/titre.