Effects of work status changes and perceived stress onglycaemiccontrol in individuals with type 1 diabetes during COVID-19 lockdown in Italy

Aims: To evaluate the effects of COVID-19 lockdown on blood glucose control in individuals with type 1 diabetes (T1D) and to explore determinants of glucose variability.

Methods: Fifty T1D patients undergoing continuous/flash glucose monitoring were recruited. The study's primary outcome was the change of time in range (TIR) from before to lockdown period. Three time-point comparisons of TIR, mean glucose levels (MG), estimated (e)HbA1c, time above (TAR) and below range (TBR), moderate/severe hypoglycemic events between pre-lockdown, lockdown and post-lockdown period were also performed. Information on lockdown-associated perceived stress, changes of work status and physical activity were recorded.

Results: TIR significantly decreased (75(63-84)% vs.69(50-76)%,p < 0.001) whereas MG (154 ± 15 mg/dl vs.165 ± 25 mg/dl, p = 0.027) and eHbA1c (7.3(6.6-7.8)%vs.7.5(6.7-8.2)%,p = 0.031) increased from pre- to lockdown period; overall glucose control significantly improved when restriction ended. Lockdown-associated work loss/suspension independently predicted impaired TIR after adjustment for potential confounders (Standardizedβ: -0.29; 95%CΙ: -18.7 to -2.25;p = 0.01). Greater TAR, TBR and hypoglycemic events were also reported during the lockdown.

Conclusion: In T1D Italian individuals, blood glucose control significantly worsened during the COVID-19 lockdown; work instability and related issues represented the main determinant of impaired glucose variability in this population.