WASHINGTON — Planned Parenthood on Thursday gave congressional leaders and a committee that is investigating allegations of criminality at its clinics an analysis it commissioned concluding that “manipulation” of undercover videos by abortion opponents make those recordings unreliable for any official inquiry.

“A thorough review of these videos in consultation with qualified experts found that they do not present a complete or accurate record of the events they purport to depict,” the analysis of a private research company said.

Cecile Richards, the president of Planned Parenthood, underscored that in a cover letter to the Senate majority leader, Mitch McConnell, and House Speaker John A. Boehner, both Republicans, and to Senator Harry Reid and Representative Nancy Pelosi, the Democratic leaders.

Shortly after the release of the analysis, the anti-abortion group responsible for the videos dismissed the attempted debunking as “a complete failure” and attributed gaps identified in the videos to “bathroom breaks and waiting periods.”