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Table 2 Methodological adequacy of evaluations of suicide prevention interventions

From: A systematic review of suicide prevention interventions targeting indigenous peoples in Australia, United States, Canada and New Zealand

1st author, year Selection bias (A) Allocation Bias (B) Confounders (C) Blinding (|D) Data collection Methods (E) Withdrawal & drop-outs (F) Analysis (G) Intervention integrity (H)
La Fromboise 1995 [41] Weak Moderate Moderate N/A Moderate Moderate -Citation for formula used in the analysis -No consent rate reported, 76% follow-up rate.
-High response rate -Number of intervention sessions received by participants not reported.
- Manual used with teacher training
-Random observations of intervention delivery by intervention co-ordinator
Berman, 1999 [42] Strong Strong Strong N/A Strong N/A -Citations to justify analysis but no citations for analysis method -Communities level of exposure to alcohol control reported and considered in analysis
Tsey, 2000 [43] Weak Weak Weak N/A Weak Moderate Citation to justify theory but not analysis -No consent rate reported and follow-up rate only partially reported
-Adaptation of existing Aboriginal-specific program,
-Components of each stage described
May, 2005 [39] Moderate Weak Weak N/A Strong N/A -No citation for formula used in the analysis - Number and type of prevention activities recorded but reported elsewhere
- Staff growth for program delivery reported
Deane, 2006 [35, 36] Moderate Weak Weak N/A Moderate Strong - Citations to justify analysis but no citations for analysis method -93% consent rate and 91% and 100% follow-up reported.
-Manual for tailored delivery, dependent on group's needs
-High response rate reported
Haggarty, 2006 [34] Weak Weak Weak N/A Weak Moderate -No citation for analysis method - 79% follow-up
- length of time of participant’s exposed to multi-media resource recorded
Westerman, 2007 [38] Weak Weak Weak N/A Moderate Moderate No description of analysis or citation. -Consent rate not reported and 77% follow-up
-Intervention delivered by Indigenous Psychological services
Muehlenkamp, 2009 [37] Weak Weak Weak N/A Moderate Weak No citation for analysis method -No consent rate reported and follow-up rate difficult to determine
-Some report of intervention exposure
-Adaptation of existing intervention
Allen, 2009 [40] Moderate Weak Strong N/A Moderate Strong -Citation for formula used in the analysis. -61% consent rate reported for individual program component
-Low to moderate response rates Intervention toolkit for tailoring to local needs
         -Intervention exposure (number and type of activities) measured and considered in analyses