Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Overall impact of protocol deviations on data integrity. Overall percentages among those with known data (ie, excluding not reported) are shown at the top of the bars. Counts by sponsor category are shown within the bars in white font. NCI, National Cancer Institute.
