Frequency of Hypoglycaemic Episodes During Treatment With Insulin Detemir in Well Controlled Subjects With Type 1 Diabetes

Inclusion Criteria: * Type 1 diabetes * Fasting c-peptide below lower limit of normal fasting range * Duration of type 1 diabetes for at least 12 months * Current treatment: Basal - bolus regimen for at least 4 months with intermediate or long-acting insulin once, twice or three times daily as basal insulin and 3-4 premeal insulin aspart or lispro injections * HbA1c maximum 9.0% (using Biorad Variant method) * Able and willing to perform self-monitoring of blood glucose * Basal insulin requirement at least 30% of the total daily insulin dose * BMI (body Mass Index) maximum 35 kg/m\^2 Exclusion Criteria: * Proliferative retinopathy or maculopathy requiring acute treatment * Total daily insulin dose above 1.4 IU/kg/day * Known unawareness of hypoglycaemia * Impaired hepatic function * Impaired renal function * Cardiac problems * Uncontrolled, treated/untreated hypertension * Known or suspected allergy to trial product or related products