Medical research is essential for advancing the understanding of health, diseases, and treatments. There are many types of studies that serve different purposes. Medical research, or health research, ...

Pew Research Center designed this study to assess the current state of online survey sampling methods – both probability-based and opt-in – and determine their accuracy on general population estimates ...

Many questions in the 2023-24 Religious Landscape Study (RLS) previously were asked in the 2007 and 2014 landscape studies. Measuring change over time on these questions is one key goal of the new RLS ...

Adverse events during hospitalization are a major cause of patient harm, as documented in the 1991 Harvard Medical Practice Study. Patient safety has changed substantially in the decades since that ...

NOTE: This post was updated on October 11, 2022. In discussions of studies 5, 7, 8 and 10, the final sentence was appended to include further information about the study. I'm a physician-scientist who ...