INS and diabetes mellitus: Baseline characteristics for group 1 and group 2 were: HbA1c 69 (7) mmol/mol [8.4 (0.6)%] vs. 52 (5) mmol/mol [6.9 (0.5)%], P < 0.001; female : male 15 : 17 vs. 15 : 14, age 40 (19) vs. 41 (13) years, P = 0.81; BMI 25.4 (4.4) vs. 25.1 (3.0) kg/m2, P = 0.76; duration of diabetes 21 (9) vs. 24 (12) years, P = 0.32; duration of pump use 8 (6) vs. 6 (4) years, P = 0.20; and pre‐study total daily insulin 0.61 vs. 0.53 U/kg/day, P = 0.036.