School-based gatekeeper training programmes in enhancing gatekeepers’ cognitions and behaviours for adolescent suicide prevention: a systematic review

Table 2 Methodological quality of the controlled trials included in the systematic review (N = 6)

Study	Random assignment	Allocation concealment	Blind	Intention-to-treat analysis
Angerstein et al. [49]	No	No	No	No
Cross et al. [13]	Yes	No	No	No
Klingman [40]	No	No	No	No
Reis and Cornell [41]	No	No	No	No
Tompkins et al. [21]	No	No	No	No
Wyman et al. [29]	Yes	No	No	Yes

ISSN: 1753-2000