Insulin Degludec/Liraglutide (IDegLira: 100 U/3.6 mg per mL) was injected subcutaneously once daily (OD) for a duration of 26 weeks. IDegLira was supplied in a 3 mL pre-filled PDS290 pen-injector with a fixed IDeg/liraglutide ratio of 100 units/3.6 mg per mL solution. IDegLira treatment was initiated at 16 dose steps (containing 16 units IDeg /0.6 mg liraglutide) and adjusted twice weekly based on the mean of three pre-breakfast self-measured plasma glucose (SMPG) values measured on the days of the titration and the two days prior to the titration (target SMPG: 4.0-5.0 mmol/L [72- 90 mg/dL]).The maximum daily dose was 50 dose steps (50U IDeg /1.8 mg Lira). All subjects continued with metformin at pre-trial doses (≥ 1500 mg or the maximum tolerated dose), unless there was a safety concern.

Subjects received insulin glargine plus prandial insulin aspart subcutaneously for duration of 26 weeks. A stable pre- trial OD dose of IGlar (20-50 units, in a 3 mL pre-filled Solostar®) was continued with metformin therapy (≥ 1500 mg or the maximum tolerated dose). IAsp was added to the IGlar therapy with a start dose of 4U using a 3 mL pre-filled FlexPen®, as prandial insulin treatment before each main meal. The dose of IGlar was adjusted twice weekly based on the mean of three pre-breakfast SMPG values measured on the days of the titration and the two days prior to the titration (target SMPG: 4.0-5.0 mmol/L [72- 90 mg/dL]). The dose of IAsp was titrated twice weekly based on pre-prandial and bedtime SMPGs, obtained on the three previous days (target SMPG: 4.0 - 6.0 mmol/L).

Change from baseline in HbA1c was analysed using a mixed model for repeated measurements with an unstructured covariance matrix. The model included treatment, visit and region as fixed factors and baseline HbA1c as covariate. Interactions between visit and all factors and the covariate were also included in the model.

Non-inferiority for IDegLira vs basal-bolus (IGlar + IAsp) was considered confirmed if the upper boundary of the two-sided 95% confidence interval was strictly below 0.30% or equivalent for non-inferiority using one-sided test for null hypothesis (H0): D ≥0.30% against alternative hypothesis (HA): D <0.30% was less than or equal to 2.5%, where D is the mean treatment difference (IDegLira minus basal-bolus).

Insulin Degludec/Liraglutide (IDegLira: 100 U/3.6 mg per mL) was injected subcutaneously once daily (OD) for a duration of 26 weeks. IDegLira was supplied in a 3 mL pre-filled PDS290 pen-injector with a fixed IDeg/liraglutide ratio of 100 units/3.6 mg per mL solution. IDegLira treatment was initiated at 16 dose steps (containing 16 units IDeg /0.6 mg liraglutide) and adjusted twice weekly based on the mean of three pre-breakfast self-measured plasma glucose (SMPG) values measured on the days of the titration and the two days prior to the titration (target SMPG: 4.0-5.0 mmol/L [72- 90 mg/dL]).The maximum daily dose was 50 dose steps (50U IDeg /1.8 mg Lira). All subjects continued with metformin at pre-trial doses (≥ 1500 mg or the maximum tolerated dose), unless there was a safety concern.

Insulin Degludec/Liraglutide (IDegLira: 100 U/3.6 mg per mL) was injected subcutaneously once daily (OD) for a duration of 26 weeks. IDegLira was supplied in a 3 mL pre-filled PDS290 pen-injector with a fixed IDeg/liraglutide ratio of 100 units/3.6 mg per mL solution. IDegLira treatment was initiated at 16 dose steps (containing 16 units IDeg /0.6 mg liraglutide) and adjusted twice weekly based on the mean of three pre-breakfast self-measured plasma glucose (SMPG) values measured on the days of the titration and the two days prior to the titration (target SMPG: 4.0-5.0 mmol/L [72- 90 mg/dL]).The maximum daily dose was 50 dose steps (50U IDeg /1.8 mg Lira). All subjects continued with metformin at pre-trial doses (≥ 1500 mg or the maximum tolerated dose), unless there was a safety concern.

Subjects received insulin glargine plus prandial insulin aspart subcutaneously for duration of 26 weeks. A stable pre- trial OD dose of IGlar (20-50 units, in a 3 mL pre-filled Solostar®) was continued with metformin therapy (≥ 1500 mg or the maximum tolerated dose). IAsp was added to the IGlar therapy with a start dose of 4U using a 3 mL pre-filled FlexPen®, as prandial insulin treatment before each main meal. The dose of IGlar was adjusted twice weekly based on the mean of three pre-breakfast SMPG values measured on the days of the titration and the two days prior to the titration (target SMPG: 4.0-5.0 mmol/L [72- 90 mg/dL]). The dose of IAsp was titrated twice weekly based on pre-prandial and bedtime SMPGs, obtained on the three previous days (target SMPG: 4.0 - 6.0 mmol/L).

Insulin Degludec/Liraglutide (IDegLira: 100 U/3.6 mg per mL) was injected subcutaneously once daily (OD) for a duration of 26 weeks. IDegLira was supplied in a 3 mL pre-filled PDS290 pen-injector with a fixed IDeg/liraglutide ratio of 100 units/3.6 mg per mL solution. IDegLira treatment was initiated at 16 dose steps (containing 16 units IDeg /0.6 mg liraglutide) and adjusted twice weekly based on the mean of three pre-breakfast self-measured plasma glucose (SMPG) values measured on the days of the titration and the two days prior to the titration (target SMPG: 4.0-5.0 mmol/L [72- 90 mg/dL]).The maximum daily dose was 50 dose steps (50U IDeg /1.8 mg Lira). All subjects continued with metformin at pre-trial doses (≥ 1500 mg or the maximum tolerated dose), unless there was a safety concern.

Subjects received insulin glargine plus prandial insulin aspart subcutaneously for duration of 26 weeks. A stable pre- trial OD dose of IGlar (20-50 units, in a 3 mL pre-filled Solostar®) was continued with metformin therapy (≥ 1500 mg or the maximum tolerated dose). IAsp was added to the IGlar therapy with a start dose of 4U using a 3 mL pre-filled FlexPen®, as prandial insulin treatment before each main meal. The dose of IGlar was adjusted twice weekly based on the mean of three pre-breakfast SMPG values measured on the days of the titration and the two days prior to the titration (target SMPG: 4.0-5.0 mmol/L [72- 90 mg/dL]). The dose of IAsp was titrated twice weekly based on pre-prandial and bedtime SMPGs, obtained on the three previous days (target SMPG: 4.0 - 6.0 mmol/L).

Insulin Degludec/Liraglutide (IDegLira: 100 U/3.6 mg per mL) was injected subcutaneously once daily (OD) for a duration of 26 weeks. IDegLira was supplied in a 3 mL pre-filled PDS290 pen-injector with a fixed IDeg/liraglutide ratio of 100 units/3.6 mg per mL solution. IDegLira treatment was initiated at 16 dose steps (containing 16 units IDeg /0.6 mg liraglutide) and adjusted twice weekly based on the mean of three pre-breakfast self-measured plasma glucose (SMPG) values measured on the days of the titration and the two days prior to the titration (target SMPG: 4.0-5.0 mmol/L [72- 90 mg/dL]).The maximum daily dose was 50 dose steps (50U IDeg /1.8 mg Lira). All subjects continued with metformin at pre-trial doses (≥ 1500 mg or the maximum tolerated dose), unless there was a safety concern.

Subjects received insulin glargine plus prandial insulin aspart subcutaneously for duration of 26 weeks. A stable pre- trial OD dose of IGlar (20-50 units, in a 3 mL pre-filled Solostar®) was continued with metformin therapy (≥ 1500 mg or the maximum tolerated dose). IAsp was added to the IGlar therapy with a start dose of 4U using a 3 mL pre-filled FlexPen®, as prandial insulin treatment before each main meal. The dose of IGlar was adjusted twice weekly based on the mean of three pre-breakfast SMPG values measured on the days of the titration and the two days prior to the titration (target SMPG: 4.0-5.0 mmol/L [72- 90 mg/dL]). The dose of IAsp was titrated twice weekly based on pre-prandial and bedtime SMPGs, obtained on the three previous days (target SMPG: 4.0 - 6.0 mmol/L).