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Table 2 Assessment schedule of primary and secondary outcomes

From: Web-based cognitive behavioral relapse prevention program with tailored feedback for people with methamphetamine and other drug use problems: protocol for a multicenter randomized controlled trial in Japan

Outcome Measurement Baseline (T1) 2-month follow-up (T2) 5-month follow-up (T3) 8-month follow-up (T4)
Primary outcome      
1 Relapse risk SRRS x x x x
2 Longest consecutive duration of abstinence Longest duration of consecutive abstinent days during the intervention #   x   
Secondary outcome      
1 Motivation to change SOCRATES x x x x
2 Self-efficacy for handling drug use and craving Self-efficacy Scale for Drug Dependence x x x x
3 Percentages of abstinent days Abstinent days in the past 28 or 56 days # x x x x
4 Differences in change of abstinent days Summed abstinent days in the past 28 days # x x x x
5 Health related quality of life WHOQOL26 x x x x
6 Sense of coherence 3-item sense of coherence scale x x x x
7 Cost of alcohol and drug Self-reported cost of drugs or alcohol in the last month (yen) x x x x
8 Treatment retention Yes or no x x x x
9 Self-help group use Yes or no x x x x
10 Psychiatric medical cost Self-reported medical use in the past six months x    x
Feasibility and usability outcome     
1 Program completion Number of completed weeks   x   
2 Satisfaction CSQ-8   x   
3 Usability and usefulness Original questionnaire   x   
  1. SRRS Stimulant Relapse Risk Scale, SOCRATES-8D Stage of Change Readiness and Treatment Eagerness Scale-8 version for drug use, CSQ-8, 8-item Client Satisfaction Questionnaire
  2. #: Self-reported drug use or abstinence assessed by web-based self-monitoring calendar or the Timeline Follow-back method