The overarching aim of the Global Action for Measurement of Adolescent Health (GAMA) Advisory Group is to support the strengthening and harmonization of global, regional and national measurement of adolescent health and well-being, advancing evidence-based action.

Specific objectives are to advise WHO and UN H6+ partners (UNAIDS, UNESCO, UNFPA, UNICEF, UN Women, the World Bank Group, and the World Food Programme) on:

• the dissemination, utilization, and measurement of the GAMA-recommended indicators at global, regional and national levels, and their periodic update to address emerging challenges;
• strategies to identify and address measurement gaps in adolescent health and well-being;
• continued alignment of global, regional and national measurement efforts.

The GAMA Advisory Group guided a structured, 5-year process to select a comprehensive set of adolescent health and well-being indicators. These 47 indicators are applicable to all adolescent population subgroups.

The GAMA-recommended menstrual health indicator is: 
Proportion of post-menarchal female adolescents (10–19 years) who were aware of menstruation before menarche

This indicator was selected from the Priority List of MHH Indicators.