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Fig. 3 | BMC Public Health

Fig. 3

From: Exploring the association between school-based peer networks and smoking according to socioeconomic status and tobacco control context: a systematic review

Fig. 3

Summary of study findings relating to selection and influence according to year of publication and country. Vertical white lines represent the introduction of a comprehensive smoking ban in each country. -1, 0 or 1 refer to the quality ratings of low, medium and high, respectively. Superscript numbers reference the study that each set of results refer to

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