INS and type 1 diabetes mellitus: Recognizing the scarce data about hypoglycaemia and how this affects diabetes control and management, the HAT study was implemented in Brazil to determine the proportion of patients experiencing hypoglycemic events, to characterize patient awareness, fear and attitudes towards hypoglycemia, and to estimate health resource use and costs of managing hypoglycemic events among patients with T1DM or insulin-treated T2DM.