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Table 2 Eligibility criteria using SPIDER 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

(S) Sample• Secondary school students (age 11–18), school staff, parents or other education professionals
• 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
(PI) Phenomenon of interest• Friendship groups and peers
(D) Study design• Qualitative
• Mixed method with a qualitative element
(E) Evaluation outcomes• Perceptions of the link between friendship, peers and smoking
• Perceptions of smoking
(R) Research type• Qualitative