What is a Global Rating of Change Scale?
A Global Rating of Change Scale (GRoC) is a self-report outcome measure used in research and clinical practice to assess a patient’s perceived change in health status over time. It is commonly used to monitor chronic conditions like lower back pain, shoulder disorders, and other musculoskeletal conditions (Kamper et al., 2009), helping clinicians evaluate treatment effectiveness and patient satisfaction.
The scale asks patients to compare their current health status or functional ability to a previous point in time, typically before treatment or an intervention. This allows for assessing clinically meaningful changes in symptoms, function, or overall well-being from the patient’s perspective.
GRoC scales typically follow a global scale with a numerical range, where positive values indicate varying degrees of improvement, negative values represent different levels of worsening, and a midpoint (such as 0 or 1) signifies no change. However, depending on the clinical or research context, different types of GRoC scales may vary in numerical range, wording, and interpretation. Some scales use an 11-point format (-5 to +5) or a 15-point format (-7 to +7), while others may adopt a visual analog scale (VAS), where patients mark their perceived change along a continuous line.










