***TASK***
the task is to simplify the input abstract of a biomedical literature

***INPUT***
the input is the abstract of a biomedical literature

***OUTPUT***
the output is the simplified abstract for the input abstract of a biomedical literature

***DOCUMENTATION***

***EXAMPLES***

Input: We identified three eligible studies after screening a total of 255 unique records. All three were performed in the United States of America and recruited substance-abusing male and female adolescents (total N=615) through homeless shelters into randomised controlled trials of independent and non-overlapping behavioural interventions. The three trials differed in theoretical background, delivery method, dosage (number of sessions,) content and outcome assessments. Overall, the variability in delivery and outcomes precluded estimation of summary of effect measures. We assessed the risk of bias to be high for each of the studies. Whilst some effect of the interventions on outcome measures were reported, heterogeneity and lack of robustness in these studies necessitate caution in interpreting the effectiveness of these interventions. The body of evidence does not permit conclusions on the impact of interventions to modify sexual risk behaviour in homeless youth; more research is required. While the psychosocial and contextual factors that fuel sexual risk behaviours among homeless youth challenge stringent methodologies of RCT's, novel ways for program delivery and trial retention are in need of development. Future trials should comply with rigorous methodology in design, delivery, outcome measurement and reporting.
Output:

In this review, we systematically searched published and unpublished accounts of interventions that had been rigorously tested . We found three eligible independently conducted randomised controlled trials testing three different interventions. All three were conducted in the United States, amongst a total of 615 homeless, male and female youth. Due to the varied delivery of interventions, outcome measurement and reporting, we were unable to aggregate outcomes to estimate summary of effect measures. The significant risk of bias associated with the three included studies and their heterogeneity necessitate caution in interpreting the effectiveness of interventions to modify sexual risk behaviour for preventing HIV in homeless youth. While studies among homeless youth are highly challenging, future trials should comply with rigorous methodology in design, delivery, outcome measurement and reporting as well as consider the changing facets of homeless youth when designing HIV prevention tools.