Table 1. Eligibility criteria.

Eligibility	Inclusion	Exclusion
Population	Adolescents and young adults aged (15–24 years)	Studies conducted among the general population
Intervention/exposure	Studies on sexual and reproductive health services	Maternal health services (antenatal care, delivery and postnatal care)
Comparator/context	Studies conducted in Africa	Studies conducted outside of Africa.
Outcome	Preferences Relative importance of attributes Willingness to pay	Cost-effectiveness Prevalence
Study characteristics	Stated preference studies. Discrete choice experiments Best–worst scaling Thurston scaling	Systematic review Commentaries Study protocols Qualitative studies Conference abstracts or proceedings
Language	Studies published in the English language	Studies published other than in the English language
Year	Studies published in 2010 and later	Studies published before 2010