Table 2

Appraisal of included studies

Intervention name	Random generation of allocation sequence	Concealed allocation	Blinding	Complete outcome data	Reporting not selective	Controlled for confounding	Accounted for clustering	Reduced other forms of bias	Suitable control group
Bullying Literature Project	NC	NS	NS	Yes	NC	NC	NS	NS	NC
Bullying Literature Project—Moral Disengagement	NS	NS	NS	Yes	Yes	Yes	No	Yes	Yes
Learning to Read in a Healing Classroom	Yes	Yes	NS	No	Yes	Yes	Yes	Yes	Yes
Linking the Interests of Families and Teachers (LIFT)	Yes	NS	Yes	Yes	NC	Yes	Yes	Yes	NC
Positive Action Hawaii	NC	NS	NS	Yes	NC	NC	Yes	Yes	Yes
Positive Action Chicago	Yes	NS	NS	Yes	NC	Yes	Yes	Yes	Yes
Promoting Alternative Thinking Strategies (PATHS)	NC	NS	NS	Yes	NC	NC	Yes	Yes	NC
Reading Writing, Respect and Resolution (4Rs)	Yes	NS	NS	Yes	No	Yes	Yes	Yes	Yes
Second Step	Yes	NS	NS	Yes	No	Yes	Yes	Yes	Yes
Steps to Respect I	NC	NS	NS	Yes	NC	NC	Yes	Yes	NC
Steps to Respect II	NC	NS	NS	Yes	NC	NC	Yes	Yes	Yes
Gatehouse	NC	NS	NS	Yes	NC	Yes	Yes	Yes	Yes
Youth Matters	NC	NS	NS	Yes	NC	Yes	Yes	NS	Yes

NC, not clear; NS, not stated.