How much change in pain score does really matter to patients?

Area of Science:

• Pain Management
• Clinical Outcomes Research
• Patient-Reported Outcomes

Background:

• Assessing treatment effectiveness requires understanding patient-perceived pain changes.
• The minimal clinically important difference (MCID) quantifies meaningful pain reduction.
• Standardized pain scales like NRS and VAS are commonly used but require MCID validation.

Purpose of the Study:

• To determine the minimal clinically important difference (MCID) for pain scores.
• To establish the patient-recognized meaningful change in pain severity.
• To evaluate the MCID using both Numeric Rating Scale (NRS) and Visual Analog Scale (VAS).

Main Methods:

• Patients rated pain using NRS and VAS upon admission and at 30, 60 minutes.
• A 5-point Likert scale assessed perceived pain change (e.g., 'much better' to 'much worse').
• Receiver operating characteristic curves and regression analysis were used to calculate MCID.

Main Results:

• The study included 150 patients and 253 pain change assessments.
• MCID was determined as 1.65 ± 1.58 for NRS and 16.55 ± 17.53 for VAS.
• NRS and VAS demonstrated high accuracy (AUC 0.86 and 0.89, respectively).

Conclusions:

• A change of 1.65 points on NRS and 16.55 points on VAS represents a meaningful improvement or worsening for patients.
• These MCID values are crucial for interpreting treatment effects in clinical practice.
• The perceived meaningful change was consistent regardless of whether pain improved or worsened.