From the Document: "This report includes historical information, including the number of women in Congress over time; means of entry to Congress; comparisons to international and state legislatures; records for tenure; firsts for women in Congress; women in leadership; African American, Asian Pacific American, Hispanic, and American Indian women in Congress; as well as a brief overview of research questions related to the role and impact of women in Congress. The Appendix provides details on the total number of women who have served in each Congress, including information on changes within a Congress. The numbers in the report may be affected by the time periods used when tallying any particular number. The text and notes throughout the report provide details on time periods used for the tallies and the currency of the information."
CRS Report for Congress, R43244