Inclusion Criteria:  Age ≥ 18 Diabetes mellitus of any type Planned visit to the outpatient diabetic clinic between 1.4. and 31.7.2021 - T2 (creation of the study group) - University hospital Ostrava, Czech Republic Known values of blood pressure, glycated haemoglobin, LDL cholesterol and BMI before the start of the pandemic (1.3.2020), not older than 6 months and no later than 31.3.2020. Signed consent to the use of anonymous data for scientific purposes and publications.  Exclusion Criteria:  failure to meet the criteria for inclusion