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Table 2 Reliability of cannabis screening instruments

From: Short scales to assess cannabis-related problems: a review of psychometric properties

Scale Study Internal consistency Test-retest reliability Item total correlation
General population samples
SDS Steiner et al. (2008) .80   
SDS Martin et al. (2006) .83 .88 (total), .69 to .85 (items)  
CAST Legleye et al. (2007) .81 [.74 for cannabis users]   .26 to .56 (pairs of items)
CUDIT Annaheim et al. (2008) .72   .07 to .55
PUM Okulicz-Kozaryn (2007) .92   
Specific user samples
SDS Swift, Hall et al. (1998) .72   
SDS Hides et al. (2007) .81   
SDS Ferri et al. (2000) .78 .74 (total), .46 to .76 (items)  
CUDIT Adamson & Sellman (2003) .78   .44 to .77