Stanford Medicine unveiled results of the Apple Heart Study, the largest study ever of its kind, which enrolled over 400,000 participants from all 50 states in a span of only eight months. Apple and Stanford created the study to evaluate Apple Watch’s irregular rhythm notification, which occasionally checks the heart’s rhythm in the background and sends a notification if an irregular heart rhythm appears to be suggestive of atrial fibrillation (AFib).

As part of the study, if an irregular heart rhythm was identified, participants received a notification on their Apple Watch and iPhone, a telehealth consultation with a doctor and an electrocardiogram (ECG) patch for additional monitoring.

“We are proud to work with Stanford Medicine as they conduct this important research and look forward to learning more about the impact of Apple Watch alongside the medical community,” Jeff Williams, Apple’s COO, said in a statement. “We hope consumers will continue to gain useful and actionable information about their heart health through Apple Watch.”

Stanford Medicine researchers presented their findings at the American College of Cardiology’s 68th Annual Scientific Session and Expo. Study results showed 0.5 percent of the over 400,000 participants received an irregular heart rhythm notification, illustrating the Apple Watch’s ability to give a user important health information without creating unnecessary burden to their doctor’s schedule. Many participants sought medical advice following their irregular rhythm notification, using the information to have more meaningful conversations with their doctors.

“As physicians, we are always trying to find ways to offer patients health information that is meaningful to them for individualized care,” Sumbul Desai, MD, Apple’s vice president of Health said in a statement. “Seeing medical research reflect what we’re hearing from consumers is positive and we’re excited to see Apple Watch helping even more consumers in the future while collaborating with the medical community to further research.”

You can read more details about the study results from the American College of Cardiology website.