Please assess the completion status of the following clinical trial:

Trial Title: Efficacy and Effectiveness of Methylphenidate in Swedish Male Prison Inmates With Attention-deficit Hyperactivity Disorder (ADHD)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Male, 18-65 years, imprisoned at Norrtalje Prison~* WURS-score of 36 or more and fulfilling at least 4 out of 6 criteria on ASRS Screener in an initial screening preceding the trial~* Can read and understand Swedish well enough to participate in the evaluation preceding the trial~* Diagnosis of ADHD according to the Diagnostic and Statistical Manual of Mental Diseases, Fourth Edition, (DSM-IV) and confirmed by the neuropsychiatric assessment including structured diagnostic interviews and neuropsychological measurements.~* At least 14 months left to conditional release.~* Informed Consent Form to participate in the study signed by the subject.~* Subject agrees to take only the supplied study drug as treatment for ADHD during the study~* Subject is able to comply with the study visit schedule and willing and able to complete the protocol-specified assessments.~* Healthy on the basis of a physical examination and the results of blood biochemistry tests. If the results of the biochemistry tests are not within the normal reference ranges, the subject may be included if the investigator considers the deviations are not clinically relevant.~Exclusion Criteria:~* Known to be a non-responder to methylphenidate.~* Known allergy or hypersensitivity to methylphenidate.~* Any clinically unstable psychiatric condition including, but not limited to, acute mood disorder, bipolar disorder, acute OCD.~* A diagnosis of substance use disorder (abuse/dependence) according to DSM-IV criteria within 3 months prior to screening evaluation for the study.~* Known mental retardation.~* Subjects with history of epileptic seizures, glaucoma, uncontrolled hypertension, angina pectoris, cardiac arrhythmias or structural heart abnormalities.~* Use of monoamine oxidase inhibitors, fluoxetine, venlafaxine, reboxetine, duloxetine.~* Use of alpha-2-receptor agonists, neuroleptics, theophylline, coumarin anticoagulants or anticonvulsants.~* Liver or renal insufficiency. Subjects with hepatitis C without liver insufficiency don´t have to be excluded as long as liver enzymes are followed through the study.~* Subjects who are suicidal.~* Lactose intolerance.

- Gender: MALE
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: f

Study Arms:
- Methylphenidate (Type: EXPERIMENTAL): PR OROS Methylphenidate given orally once daily for 5 weeks. The dosage was as follows: 36 mg per day from day 1-3, 54 mg per day from day 4-7 and 72 mg per day from day 8 until end of 5th week.
- Sugar pill (Type: PLACEBO_COMPARATOR): Placebo given orally once daily for 5 weeks.

Based on this trial design, predict the completion outcome and termination type (if applicable).