Fig. 2From: Effectiveness of needle and syringe Programmes in people who inject drugs – An overview of systematic reviewsStudies selected for inclusion classified by outcome(s) reported and strategy for data synthesis. *Grey shaded boxes represent the outcome reported in the reviews indicated in the right column. “HIV”, ”HCV” and “Injecting risk behaviours” is used to classify the reviews that reported the impact of NSP in the number of HIV infections, number of HCV infections and change in injection behavior. The reviews are also presented in the right column by strategy used for data synthesisBack to article page