What this trial measures

• Pain CatastrophizingParticipants will be assessed as part of a cohort for up to 7 months. There will be a total of three cohorts.

  This measure is a 13-item self-assessment instrument of pain-related negative thoughts, and measures constructs of rumination, magnification and helplessness. It is the primary outcome measure of this research study. Each item is measured on a 5-point Likert scale, with endpoints 0 (not at all) to 4 (all the time) and possible scores ranging from 0-52. In a clinical setting, such as a pain clinic providing treatments for chronic pain, a score on this measure of "10" or higher indicates a person could benefit from treatment; however, the published cut-off scores are higher and as follows: a Total Score of 20 is considered in the average range (50th percentile), and a Total Score of \>= 30 is above average (75th percentile). This measure is shown to have excellent internal consistency (coefficient alphas: total PCS = .87, rumination = .87, magnification = .66, and helplessness = .78.