Table 2.

Characteristics of the included studies.

Authors	Type of Study	Year of Publication	Time of the Study	Country	Study Population	T1D Diagnosis Criteria
Hummel et al. [17]	Prospective Cohort	2000	1989–1999	Germany	658	NA
Hupmann et al. [18]	Prospective Cohort (Brief Report)	2005	1989–2000	Germany	1610	World Health Organization criteria
Rousseau et al. [10]	Retrospective Cohort	2016	1974–1994	Canada	78,492	One of these definitions: (1) ≥2 diabetes-related medical visits within 2 years or ≥1 hospitalization for diabetes (2) ≥4 diabetes-related medical visits within 2 years
Corsenac et al. [9]	Prospective Cohort	2021	1985–1993	Canada	387,704	≥4 related physician claims over a 2-years period, with at least 30 days between two claims
Corsenac et al. [19]	Prospective Cohort	2021	1997–2014	Canada	396,118	≥1 hospitalization OR ≥2 physician claims for DM within two years, with ≥1 day between two services AND using only insulin

NA: Not available.