A Phase III, Randomised, Double-blind, Placebo-controlled, Parallel Group Study of Six Months Treatment With Ropinirole PR as Adjunctive Therapy in Patients With Parkinson's Disease Who Are Not Optimally Controlled on L-Dopa

Mean Change From Baseline (BL) in the Unified Parkinson Disease Rating Scale (UPDRS) Total Motor Score at Week 24 Using LOCF

The UPDRS, a clinician-based rating scale, assesses 6 features of PD impairment: (1) mentation, behavior, and mood; (2) activities of daily living; (3) motor examination; (4) complications of therapy; (5) modified Hoehn and Yahr stage; (6) Schwab and England activities of daily living scale. Assessments were conducted when participants had benefit in regard to mobility, tremor, and rigidity. The total motor score (sum of motor examination) ranges from 0 to 108: 0=normal/no symptoms; 108=worst possible case. Change from BL was calculated as the value at Week 24 minus the value at BL.

Time frame: Baseline and Week 24 (Visit 13)

Mean Change From Baseline in the Percentage of Awake Time Spent "Off" (ATSO) at Week 24 Using LOCF

The "off" state is defined as the state in which PD symptoms (lack of mobility, tremor, or rigidity) are not adequately controlled by the drug. Participants were asked to record the duration of their "off" periods in 24-hour diary cards prior to each visit on the same 2 days of each relevant week. The total number of awake hours spent "off" per 24-hour period was the sum of the hours recorded on the two 24-hour diary cards. The percentage of ATSO=ATSO divided by (ATSO + awake time spent "on") \* 100. Change from Baseline was calculated as the value at Week 24 minus the value at Baseline.

Time frame: Baseline and Week 24

Mean Change From Baseline in Total Awake Time Spent "on" at Week 24 Using LOCF

The "on" state is defined as the state in which the PD symptoms (lack of mobility, tremor, or rigidity) are adequately controlled by the drug. Participants were asked to record the duration of their "on" periods in 24-hour diary cards prior to each visit on the same two days of each relevant week. The total number of awake hours spent "on" per 24-hour period was the sum of the hours recorded on the two 24-hour diary cards. Change from Baseline is calculated as the value at Week 24 minus the Baseline value.

Time frame: Baseline and Week 24

Mean Change From Baseline in Total Awake Time "on" Without Troublesome Dyskinesias (TD) at Week 24 Using LOCF

Dyskinesias are involuntary twisting, turning movements caused by medication during "on" time in PD. TD is defined as those movements that interfere with function and cause meaningful discomfort. Participants were asked to record the number of awake hours spent "on" without TD in 24-hour diary cards prior to each visit on the same two days of each relevant week. The total number of awake hours spent"on"without TD per 24-hour period was the sum of the hours recorded on the two 24-hour diary cards. Change from Baseline is calculated as the value at Week 24 minus the Baseline value.

Time frame: Baseline and Week 24

Mean Change From Baseline in the UPDRS Activities of Daily Living (ADL) Score at Week 24 Using LOCF

The UPDRS assesses six features of PD impairment, including Activities of Daily Living (ADL). The total ADL score ranges from 0 to 52, where 0= normal/no symptoms and 52= worst possible case. Change from Baseline is calculated as the value at Week 24 minus the Baseline value.

Time frame: Baseline and Week 24

Number of Responders Based on the Clinical Global Impression (CGI) Global Improvement Scale Using LOCF

The CGI global improvement scale allows the investigator to rate the participant's total improvement since the beginning of treatment (Baseline). Scores on the scale range from 1 to 7 (1=very much improved, 2=much improved, 3=minimally improved, 4=no change, 5=minimally worse, 6=much worse, and 7=very much worse). Participants with a CGI global improvement score of \<=2 (representing much improved or very much improved) were considered to be responders.

Time frame: Week 24

Number of Participants Requiring Reinstatement of L-dopa Following a Dose Reduction Using LOCF

In the event of unacceptable side effects relative to Baseline (e.g., dyskinesias, dystonias \[neurological movement disorder\]) the dosage of L-dopa was reduced. If there was reduction in the side effects and there was loss of symptom control, the dose of study medication was again increased (reinstated) at subsequent visits. If symptoms could still not be controlled, then L-dopa was reinstated; however, the dose could not exceed the baseline dose.

Time frame: Week 24

Number of Responders to Study Treatment Using LOCF

The "off" state is defined as the state in which PD symptoms (lack of mobility, tremor, or rigidity) are not adequately controlled by the drug. Responders are defined as participants who had at least a 20% reduction from Baseline in awake time spent "off" and at least a 20% reduction from Baseline in the L-dopa dose.

Time frame: Baseline to Week 24

Mean Change From Baseline in the Depression Scores on the Hamilton Depression Rating Scale (HAMD-17) Using LOCF

The HAMD-17 is a 17-item scale that is completed by the investigator. Each item was evaluated and scored using either a 5-point scale (e.g., absent, mild, moderate, severe, very severe) or a 3-point scale (e.g., absent, mild, marked). The total HAMD-17 score (sum of the scores of all 17 items) may range from 0 (least severe) to 52 (most severe). Change from Baseline is calculated as the value at Week 24 minus the Baseline value.

Time frame: Baseline and Week 24

Mean Change From Baseline (BL) in the Parkinson's Disease Sleep Scale (PDSS) Total Score Using LOCF

The PDSS uses a series of 15 questions to assess sleep disturbance associated with PD. Participants completed the assessments based on their experiences in the past week by marking a cross on each 10 centimeter (cm) scale (labelled from worst to best state). Responses were quantified by measuring the distance along each line where the cross was placed. The scores for each item ranged from 0 (symptom severe and always experienced) to 10 (symptom free). The maximum cumulative score for the PDSS was thus 150 (free of all symptoms). Change from BL=value at Week 24 minus the BL value.

Time frame: Baseline and Week 24

Mean Change From Baseline in the Parkinson's Disease Quality of Life Scores (PDQ39) Using LOCF

The PDQ39 is a 39 item self-administered questionnaire. The questionnaire covers eight domains of health that are reported as adversely affected by patients with PD. Participants were asked to rate responses on a scale from 0 to 4 ("never" to "always"). The overall index score is the mean of the eight individual domain scores measured on a continuous scale ranging from 0 (no problem at all) to 100 (maximum level of the problem). Change from Baseline is calculated as the value at Week 24 minus the Baseline value.

Time frame: Baseline and Week 24

Time to Reinstatement of L-dopa Following a Reduction in Dose Using LOCF

The mean number of days after which the dose of L-dopa was readministered after the reduction in dose was recorded.

Time frame: Baseline to Week 24