Final answer:
On an 11-point Global Rating of Change scale, a '0' indicates there has been no change in a patient's pain or condition.
Step-by-step explanation:
If a patient marks a "0" on an 11-point Global Rating of Change (GRoC) scale, this would typically indicate that there has been no change in their pain or condition. The GRoC scale is often used by healthcare providers to assess the change in a patient's symptoms or condition over time. In this scale, a score of '0' implies no change, positive numbers suggest improvement and negative numbers indicate that the condition has worsened. It is important to note that the GRoC is subjective and is based on the patient's assessment of change in their condition or pain.