Pregabalin Treatment Of Peripheral Neuropathic Pain Associated With Diabetic Peripheral NeP (DPN), Postherpetic Neuralgia (PHN), HIV-related NeP (HIV), and Chemotherapy Induced NeP

Change From Baseline in Mean Pain Score on the Daily Pain Rating Scale (DPRS)

11 point Likert scale; range: 0 to 10 (no pain to worst possible pain) over past 24 hours. Baseline score = mean score of preceding 7 days (including Visit 2). Weekly pain score = mean pain score from last 7 post-Baseline days preceding observation visit or last 7 days on study drug for early termination. Change = mean at observation minus mean at Baseline.

Time frame: Week 4, Week 8, Week 12

Change From Baseline (BL) in Modified Brief Pain Inventory-Short Form (m-BPI-sf): Pain Severity Index Scores

Self-administered questionnaire: change from Baseline in mean pain severity index over past 24 hours; 11-point numeric rating scale ranging from 0 (no pain) to 10 (worst pain possible). Pain severity index is the mean of item scores 2, 3, and 4 (pain right now, worst pain, and average pain level). Change = mean score at observation minus mean score at Baseline.

Time frame: Baseline, Week 8, Week 12, EOT/LOCF

Change From Baseline in Modified Brief Pain Inventory-Short Form (m-BPI-sf): Pain Interference Index Scores

Self-administered questionnaire: change from Baseline in mean pain interference with functional activities (general activity, mood, walking ability, relations with other people, sleep, normal work, and enjoyment of life) in past 24 hours. 11-point scale from 0 (does not interfere) to 10 (completely interferes). Change = observation mean minus Baseline mean.

Time frame: Baseline, Week 8, Week 12, End of Treatment/Last Observation Carried Forward (EOT/LOCF)

Pain Treatment Satisfaction Scale (PTSS): Impact of Current Pain Medication

Impact of current pain medication response scale: 0 (worst possible response) to 100 (best possible response). Score=\[(5-mean of non-missing items)\*100\]/4.

Time frame: Baseline, Week 8, Week 12, EOT/LOCF

Pain Treatment Satisfaction Scale (PTSS): Satisfaction With Current Pain Medication

Satisfaction with current pain medication response scale: 0 (worst possible response) to 100 (best possible response). Score=\[(5-mean of non-missing items)\*100\]/4.

Time frame: Baseline, Week 8, Week 12, EOT/LOCF

Change From Baseline in Visual Analogue Scale for Pain (VAS-pain)

100 mm line (Visual Analog Scale) marked by subject; Intensity of pain range (over past week): 0 = no pain to 100 = worst possible pain. Change = observation mean minus Baseline mean.

Time frame: Baseline, Week 1, Week 2, Week 3, Week 4, Week 8, Week 12, EOT/LOCF

Change From Baseline in Global Anxiety Visual Analogue Scale (GA-VAS)

100-mm line (Visual Analog Scale) marked by the subject to measure their degree of anxiety over past 24 hours. Range: 0 = not at all anxious to 100 = extremely anxious. Change = mean score at observation minus mean score at Baseline.

Time frame: Baseline, Week 8, Week 12, EOT/LOCF

Change From Baseline in Mean Daily Sleep Interference Score (DSIS)

Daily sleep interference measured on an 11-point Likert scale. Range: 0 (pain did not interfere with sleep) to 10 (pain completely interfered with sleep). Change = mean at observation minus mean at Baseline. Evaluations recorded in patient's daily sleep diaries.

Time frame: Baseline, Week 1, Week 2, Week 3, Week 4, Week 5, Week 6, Week 7, Week 8, Week 9, Week 10, Week 11, Week 12, EOT/LOCF

Patient Global Impression of Change (PGIC)

7-point participant rating scale for change observed in their overall status since beginning of study medication. Range: 1 (very much improved) to 7 (very much worse)

Time frame: End of Treatment/ Last Observation Carried Forward (Week 12 or last post-baseline assessment)

Clinical Global Impression of Change (CGIC)

7-point investigator rating scale of change in participant's status since beginning study medication. Range: 1 (very much improved) to 7 (very much worse).

Time frame: End of Treatment/ Last Observation Carried Forward (Week 12 or last post-baseline assessment)