What is the percentage of the control group that achieved the primary endpoint for pain relief at 12 months?

To determine the percentage of the control group that achieved the primary endpoint for pain relief at 12 months, it's important to rely on the data provided from the relevant study or trial. In this case, the correct answer is 70%. This percentage signifies that a significant proportion of participants within the control group experienced substantial relief from pain after the one-year period.

This outcome is indicative of the effectiveness of the treatment or intervention being tested, comparing it to what might be expected from standard or non-intervention conditions. Understanding this percentage helps in evaluating the relative effectiveness of various treatments and can be pivotal for clinicians and researchers when discussing the overall efficacy of a particular approach to pain management.

In clinical trials, estimating the percentage of improvement in the control group can also aid in setting realistic expectations for treatment outcomes, conveying important information to both healthcare providers and patients.