INS and diabetes mellitus: Those with T1D were younger than those with T2D (age 42.1 years vs. 60.8 years, respectively), had a longer duration of diabetes (17.6 years vs. 13.7 years, respectively) and, as insulin use in patients with T1D starts at diagnosis, had therefore been using insulin for a longer period than patients with T2D (17.0 years vs. 6.4 years, respectively).