Lindner LME, et al. - The associations of individual-level as well as area-level socio-economic status and area-level deprivation with glycaemic control, hypoglycaemia and diabetic ketoacidosis in people with Type 1 diabetes mellitus were investigate in this systematic review. Among people with Type 1 diabetes mellitus, lower socio-economic status and higher area-level deprivation were associated with a higher risk of experiencing diabetic ketoacidosis. For socially deprived people, access to care ought to be expanded to overcome impairing effects on the course of the condition and to reduce healthcare disparities.