INS and diabetes mellitus: In patients without DM, diabetic patients on oral antidiabetic drug and diabetic patients on insulin therapy, the median [25–75th percentiles] follow-up was 11.3 [10.0–13.5] years, 11.2 [7.8–13.6] years and 11.1 [4.3–12.1] years, respectively (p = 0.392).