INS and diabetes mellitus: Furthermore, the insulin-free period (13.6 ± 6.4 vs. 4.3 ± 5.7 years, P<0.0001) and the duration before the diagnosis of GADAb-positive diabetes (9.4 ± 7.4 vs. 6.7 ± 8.9 years, P<0.001) were significantly longer in the NIR-SPIDDM patients than in the IR-SPIDDM patients.