Note: The data cover medical and nonmedical staff members who perform faculty duties like instruction, research, and/or public service at 3,307 four- and two-year degree-granting public and private nonprofit institutions in the United States that are eligible to participate in the Title IV federal student-aid program. Medical schools are counted in the data. Non-tenure-track faculty members include adjuncts. Faculty members with no tenure status include those who are neither tenured nor on the tenure track at institutions with tenure systems, as well as those who work at institutions without tenure systems. For-profit institutions, which have very few tenured or tenure-track faculty members, were excluded from this analysis. Percentages are rounded, but regions were ranked before rounding.