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Recommendations for standardization of bleeding data analyses in contraceptive studies.

Mitchell D Creinin1, Carolina Sales Vieira2, Carolyn L Westhoff3

  • 1Department of Obstetrics and Gynecology, University of California, Davis, Sacramento, CA, United States.

Contraception
|May 31, 2022
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Summary

New recommendations standardize menstrual bleeding data for contraceptive research. Standardized criteria for bleeding pattern, flow, and duration improve user and clinician understanding of contraceptive side effects.

Keywords:
BleedingContraceptionDurationFlowPatternRecommendations

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Area of Science:

  • Reproductive Health
  • Contraception Research
  • Clinical Trial Methodology

Background:

  • Existing definitions for menstrual bleeding changes with contraceptive use lack standardization.
  • This ambiguity hinders clear communication and comparison of contraceptive method outcomes.

Purpose of the Study:

  • To develop standardized recommendations for analyzing menstrual bleeding data in contraceptive research.
  • To improve information provided to users, clinicians, researchers, pharmaceutical companies, and regulatory agencies.

Main Methods:

  • A panel convened to establish new criteria for bleeding outcomes.
  • Proposed criteria include pattern, flow, and duration, with specific descriptors for predictable and unpredictable bleeding patterns.
  • Recommended study durations vary by contraceptive type (e.g., 12 months for short-acting, 2 years for injectables).

Main Results:

  • Introduced three independent criteria: bleeding pattern (quantifying scheduled, unscheduled, or frequency), flow (patient-reported comparison to typical flow), and duration (prolonged episode >7 days).
  • Defined specific assessment durations for various contraceptive regimens to ensure comprehensive data collection.
  • Standardization allows for better understanding of bleeding profiles and product differences.

Conclusions:

  • Standardized assessment of bleeding pattern, flow, and duration provides a comprehensive understanding of contraceptive-related bleeding outcomes.
  • This standardization facilitates improved study comparisons, data synthesis, and informed decision-making for contraceptive users and providers.