Which of the following forms is used to collect trial baseline data?

The Demographics and Trial Baseline Data Form is specifically designed to gather essential baseline information from trial participants before they begin the study intervention. This form collects demographic details such as age, sex, race, and other relevant characteristics that can influence the study's outcomes. Additionally, it captures other baseline data that are crucial for stratifying and analyzing the results, allowing researchers to establish a foundation for any changes or effects observed during the trial.

In contrast, the other forms serve different purposes. For instance, the Concomitant Form focuses on recording any additional treatments or medications participants might be using alongside the study intervention, rather than baseline data. The Adverse Events Form is utilized to document any negative side effects experienced by participants during the trial, and the Investigational Therapy Form pertains to the specifics of the study treatment itself. Each of these forms plays an integral role in the overall process, but they do not specifically address the collection of baseline data, which is why the Demographics and Trial Baseline Data Form is the correct choice for this question.