The Institute of Medicine’s 2015 report “Dying in America: Improving Quality and Honoring Individual Preferences Near the End of Life” was the fourth most-frequently downloaded or purchased report from the National Academies Press in 2015, according to the organization. Downloaded at no charge were 13,107 PDF copies.

Cognitive Aging: Progress in Understanding and Opportunities for Action,” an IOM report that had 10,745 downloads, came in at number seven on the list.

The National Academies Press released more than 200 reports of the National Academies of Sciences, Engineering and Medicine on The IOM is a division of the Academies. More than 1.5 million free PDFs of the reports were downloaded in 2015, the most ever in one year.

Some other titles on the top 15 list:

Number five: The National Academies’ “Improving Diagnosis in Health Care,” with 11,790 downloads.

Number six: The IOM’s “Vital Signs: Core Metrics for Health and Health Care Progress,” with 11,003 downloads.

Number 14: The IOM’s “Transforming Health Care Scheduling and Access: Getting to Now,” with 6,881 downloads.