Time-weighted average (area under the curve [AUC]) of the weekly average Patient Experience Diary (PED)-reported morning recall pain scores for weeks 1 through 12 of the stable dose treatment phase is the area under the Patient Experience Diary (PED)-time curve estimated using the trapezoidal method and normalized by time.

PED is the Patient Experience Diary, an electronic diary system used for collection of patient self-reported pain data. Outcome measure is assessed using the VAS Pain Intensity Scale from 0-100 millimeters anchored at 0 mm (no pain) to 100 mm (worst possible pain).

The analysis was performed based on intent-to-treat population defined as all randomized patients who took at least one dose of double-blind study medication. For all subjects with missing assessments for weeks 1-12 of the stable dose treatment phase, values were imputed using last observation carried forward (LOCF).

Time-weighted average (area under the curve [AUC]) for Patient Global Impression of Change (PGIC) from Visit TX0-TX12 is the area under the PGIC-time curve estimated using the trapezoidal method and normalized by time.

PGIC is an efficacy assessment on a scale of 1-7 taken at visits TX0-TX12. The wording of the assessment is as follows: "Since the start of the study, overall my fibromyalgia is:" 1=Very Much Improved, 2=Much Improved, 3=Minimally Improved, 4=No Change, 5=Minimally Worse, 6=Much Worse, and 7-Very Much Worse.

The analysis was performed based on intent-to-treat population defined as all randomized patients who took at least one dose of double-blind study medication. For all subjects with missing assessments from weeks 1-12 of the stable dose treatment phase, values were imputed using last observation carried forward (LOCF).

Change from Baseline in the Multi-Dimensional Fatigue Inventory (MFI) total score at TX12. Negative differences indicate decrease of fatigue.

MFI is a subjective report of fatigue symptoms consisting of 20 items that can be scored to produce 5 dimensions: general fatigue, physical fatigue, mental fatigue, reduced motivation, and reduced activity. The MFI is a 1-5 scale with 1="yes, that is true" and 5="no, that is not true."

The analysis was performed based on intent-to-treat population defined as all randomized patients who took at least one dose of double-blind study medication. For all subjects with missing assessments at the end of week 12 (Visit TX12), values were imputed using Last Observation Carried Forward (LOCF).

Composite Syndrome Responder Status is the number of responders based on 3 domains: (1) 30% reduction in pain (as recorded in the Patient Experience Diary [PED], electronic diary, during the morning report; 24 hour recall); (2) patient global impression of change (PGIC) score of "very much improved" and "much improved;" and (3) physical function improvement of 6 or more points on Short Form-36 Physical Component Summary (SF-36 PCS)

The primary efficacy analysis was performed based on intent-to-treat population defined as all randomized patients who took at least one dose of double-blind study medication. All subjects with missing assessments at the end of the three-month stable dose treatment phase were considered non-responders (baseline value carried forward (BOCF)).

Composite Pain Responder Status is the number of responders based on two domains: (1) 30% reduction in pain (as recorded in the Patient Experience Diary [PED], electronic diary, during the morning report; 24 hour recall); and (2) Patient Global Impression of Change (PGIC) score of "very much improved" or "much improved."

The primary efficacy analysis was performed based on intent-to-treat population defined as all randomized patients who took at least one dose of double-blind study medication. All subjects with missing assessments at the end of three-month stable dose treatment phase were considered non-responders (baseline value carried forward (BOCF)).

Short Form-36 (SF-36): pt. questionnaire (36 questions) which give rise to 8 domains & 2 component summaries (mental and physical); assessing quality of life, health & functional status.

SF-36 PCS: weighted summary of physical function using all 8 domains.

Scores are standardized so that the range for all domains and component summaries is 0 (worst possible score) to 100 (best possible score). Higher scores indicate better health or functional status.

SF-36 PCS AUC (Area under the Curve): estimated using trapezoidal method, normalized by time.

The analysis was performed based on intent-to-treat population defined as all randomized patients who took at least one dose of double-blind study medication. For all subjects with missing assessments from weeks 1-12 (Visit TX0-TX12) of the stable dose treatment phase, values were imputed using the Last Observation Carried Forward (LOCF) approach.