Backgrounds and aims: To assess incidence of diabetes in Italy in 2018 by the use of administrative claims from several million residents. Differences in rates in men and women across decades of age were investigated. Incident rates of insulin or noninsulin treated subjects were also examined. Methods and results: We analyzed administrative healthcare claims of 11,300,750 subjects monitored by the ARNO Diabetes Observatory. Incident cases of diabetes were identified by glucose lowering drug prescriptions, disease-specific co-payment exemptions and hospital discharge codes related to diabetes occurring in 2018 but not in 2017. We identified 697,208 subjects with ascertained diabetes. Incident cases were 65,932, with a rate of 5.83 per 1000 person-years (p-y). Incidence of drug-treated diabetes (n = 60,271) was 5.33 per 1000 p-y. Subjects receiving only insulin prescriptions were 5652 (rate 0.50 per 1000 p-y) and those receiving only prescriptions of noninsulin medications were 51,085 (rate 4.52 per 1000 p-y). Incidence rates progressively increased across decades until age 80 and then dropped by 25-30%. Overall, incident rates were generally higher in women aged 11-40 and in men aged ≥51. Conclusions: Recent cases represented ~10% of the population of diabetic subjects. Incidence of noninsulin-treated diabetes was almost 10-fold higher than incidence of insulin-treated diabetes. Substantial differences in incidence rates were observed in men and women of several decades of age: women more affected in adolescence and young adult age, men more affected in mature and advanced age. These data provide further understanding on the epidemiological burden of the disease in Italy.
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