Search strategies
Searcheswere conducted using three electronic databases:
Medline, Psyinfo and Psyindex, for the period
from January 1999 to May 2010. Highly sensitive
strategies were developed using a combination of
controlled vocabulary and free-text terms. Separate
search strategieswere developed for each of the databases.
ForMedline and Psyinfo terms to denote ‘peer
education’ interventions (e.g. ‘PEER TUTORING’,
peer deliver*; student* led) were combined with
general and specific terms related with HIV prevention,
adolescent pregnancy and sexual health promotion
(e.g. ‘HIV PREVENTION’, ‘ADOLESCENT
PREGNANCY’, ‘SEX EDUCATION’). For
Psyindex, only terms to denote ‘peer education’
were included.