Table 2 Assessment schedule of primary and secondary outcomes
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 | |||