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Table 2 Methodology Quality Score (MQS; adapted from Gurman and Kniskern 1978; Stanton and Shadish 1997)

From: Selective prevention programs for children from substance-affected families: a comprehensive systematic review

  Criteria and their scores Maximum score
1 Controlled assignment to treatment conditions (random assignment, matching of total groups or controlled design, without randomization (2.5) matching in pairs) 5
2 Pre-post-measurement of change 5
3 Sample size N = 50-100 (0.5) N = 100-150 (1) N > 150 (1.5) 1.5
4 No contamination of major independent variables: Most important independent variable is valid, i.e., parental substance use proven (2), very likely (1), program implemented by professional staff (3) 5
5 Appropriate statistical analyses 1
6 Data collected via self-assessment and expert interviews 1
7 Follow-up in months 1–3 (0.5), 4–6 (1), 7–12 (1.5) 13–18 (2), 19–24 (2.5) >24 (3) 3
8 Evidence of treatment adherence: probably (0.5), certainly, as stated by the authors (1), verifiable (1.5) 1.5
9 Multiple change indices 1
10 Multiple vantage points for assessing outcome, multiple criterion measurement 1
11 Quality of instruments reported 1
12 Simultaneous data collection for the control group; Non-simultaneous data collection for the control group (0.5) 1
13 Outcome assessment: Non-responder – improvement (0.5)Deterioration – improvement (1) 1
14 Therapist-investigator nonequivalence: examiners not involved in program delivery 1
15 Treatment dropouts / intent-to-treat analyses 1