The primary efficacy variable was the change from baseline on the NRS. The primary time point was the average pain score during the last data-analysis-interval of week 8. The baseline score was the average of the NRS scores across the last 7 days of the screening period (just prior to the start of the placebo run-in). The primary efficacy variable was the pain severity score measured on an 11 point NRS on which 0=no pain and 10=worst possible pain.

The Modified Intent to Treat (MITT) population included all randomized subjects who had taken at least one dose of double-blind test article, who had a baseline primary efficacy evaluation, and who had at least one primary efficacy evaluation on double-blind therapy.

The efficacy variable was the change from baseline on the numeric rating scale (NRS). The time point was the average pain score during the last data-analysis-interval of week 8, data analysis interval. The baseline score was the average of the NRS scores across the last 7 days of the screening period (just prior to the start of the placebo run-in). The efficacy variable was the pain severity score measured on an 11 point NRS on which 0=no pain and 10=worst possible pain.

All randomized subjects who had taken at least one dose of double-blind test article, had a baseline primary efficacy evaluation, and had at least one primary efficacy evaluation on double-blind therapy. Subjects who did not complete the study due to its discontinuation were excluded.