Introduction: Adolescent pregnancy is defined as pregnancy at the age of 19 or below. Pregnancy and childbirth complications are the most significant cause of death among 15–19-year-old girls. Several studies have indicated that inequitable gender norms can increase the vulnerability of adolescent girls, including violence exposure, early marriage, and adolescent pregnancy. To address these disparities, gender transformative approaches aim to challenge and transform restrictive gender norms, roles, and relations through targeted interventions, promoting progressive changes. This realist review aims to synthesise existing evidence from a broad range of data sources to understand how, why, for whom, and in what contexts gender transformative approaches succeed in reducing adolescent pregnancy in low- and middle-income countries.

Method and analysis: We employ a five-step realist synthesis approach: (1) clarify the scope of review and assessment of published literature, (2) development of initial programme theories, (3) systematic search for evidence, (4) development of refined programme theories, and (5) expert feedback and dissemination of results. This protocol presents the results of the first three steps and provides details of the next steps.

We extracted data from 18 studies and outlined eight initial programme theories on how gender transformative approaches targeting adolescent pregnancy work in the first three steps. These steps were guided by experts in the field of sexual and reproductive health, implementation science, and realist methodology. As a next step, we will systematically search evidence from electronic databases and grey literature to identify additional studies eligible to refine the initial programme theories. Finally, we will propose refined programme theories that explain how gender transformative approaches work, why, for whom, and under which circumstances.

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