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Table 1 Eligibility criteria using the PECO format

From: Associations between school-based peer networks and smoking according to socioeconomic status and tobacco control context: protocol for a mixed method systematic review

(P) Population• Secondary school students (age 11–18)
• Focused on whole population or students of a low socioeconomic status
• Papers published from 1997 onwards, using data from 1997 onwards
• Papers with abstracts written in English
(E) Exposure• Network characteristics (number of ties, network structure, betweenness and degree centrality, density)
• Any study conducting cross-sectional or longitudinal network analysis
(C) Comparator• Not applicable
(O) Outcome• Link between network characteristics and smoking behaviour and attitudes
• Network characteristics
• Smoking prevalence