Evidence for sample selection effect and Hawthorne effect in behavioural HIV prevention trial among young women in a rural South African community.

ABSTRACT:

Objectives

We examined the potential influence of both sample selection effects and Hawthorne effects in the behavioural HIV Prevention Trial Network 068 study, designed to examine whether cash transfers conditional on school attendance reduce HIV acquisition in young South African women. We explored whether school enrolment among study participants differed from the underlying population, and whether differences existed at baseline (sample selection effect) or arose during study participation (Hawthorne effect).

Methods

We constructed a cohort of 3889 young women aged 11-20 years using data from the Agincourt Health and socio-Demographic Surveillance System. We compared school enrolment in 2011 (trial start) and 2015 (trial end) between those who did (n=1720) and did not (n

SUBMITTER: Rosenberg M 

PROVIDER: S-EPMC5781067 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature