Aim:
Several studies have assessed the association between personality traits and metabolic outcomes in children and adolescents with type 1 diabetes (T1DM). The aim of this observational single-visit study was to investigate whether specific personality traits were related to the degree of metabolic control/diabetes duration in adult T1DM patients.

Method:
Data were collected from 56 adults (40 men) with T1DM treated in a tertiary care center. “Big Five” personality traits were assessed using the NEO-Five Factor Inventory questionnaire. Several variables were obtained from the insulin pumps, glucometers and blinded continuous glucose monitoring system.

Results:
All personality traits but neuroticism (low level of the trait) showed average intensity. Agreeableness was associated with most variables from CGMS data. Higher conscientiousness was associated with longer diabetes duration. Higher neuroticism was correlated with greater glycemic variability (GV), while high Extraversion was associated with lower GV. Lower Openness was associated with prolonged time in clinically significant hypoglycaemia.

Conclusions:
Our study suggest that personality traits manifest in individual approach to diabetes management and emotion regulation, translating also into the attitude to treatment. On the other hand, T1DM patients’ overall trait scores were consistent with healthy nonpsychiatric norms, which debunks myths and stereotypes suggesting that chronic disease is usually associated with psychopathology.