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Table 1 Overview of measurements and instruments

From: Evaluating the efficacy of a web-based self-help intervention with and without chat counseling in reducing the cocaine use of problematic cocaine users: the study protocol of a pragmatic three-arm randomized controlled trial

Assessments/instruments Baseline 6 weeks 6-month follow-up
Socio-demographics x   
SDS x x x
Quantity of cocaine use1) x x x
Days of cocaine use over past 30 days x x x
FDA x x x
MHI-5 x   x
SSQ-6 x x x
WAI-SR2)   x  
CSQ-43)   x  
  1. 1) The weekly quantity of cocaine use will be derived from the consumption diary and measured every week between the baseline assessment and week 6
  2. 2) This instrument will only be applied to participants in study arm 1 (the self-help intervention with chat counseling)
  3. 3) This instrument will only be applied to participants in study arms 1 and 2 (self-help intervention with chat counseling vs. self-help intervention alone)