Please assess the completion status of the following clinical trial:

Trial Title: A Study of the Effectiveness and Safety of Prolonged-release Methylphenidate Hydrochloride in Adult Patients With Attention Deficit/Hyperactivity Disorder.

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

Eligibility Criteria:
Inclusion Criteria:~* Adults with a diagnosis of Attention Deficit/Hyperactivity Disorder (ADHD) according to DSM-IV criteria~* ADHD symptoms from childhood to adulthood, with some symptoms present before age 7 years which continue to meet DSM-IV criteria at the time of assessment. (ADHD is not diagnosed if the symptoms are better accounted for by another psychiatric disorder.)~Exclusion Criteria:~* Patients known to be a non-responder to methylphenidate or known to have a child who is a non-responder to methylphenidate~* treated with any methylphenidate-containing medication within 1 month of starting the study~* have any clinically unstable psychiatric condition including, but not limited to the following: acute mood disorder, bipolar disorder, acute obsessive-compulsive disorder, anti-social personality disorder, borderline personality disorder~* family history of schizophrenia or affective psychosis~* patients with motor tics or a history of Tourette's syndrome, or with a substance abuse or dependence disorder, an eating disorder, or mental retardation~* using any medications which may affect the evaluation of study results

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

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