Table 2.

Components of Methodological Quality and Rigor of Included Studies (n = 26)

Methodological Criteria	N	%
1. Single-group design (no comparison group)	7	26.9
2. Quasi-experimental design (non-equivalent comparison group)	6	23.1
3. Experimental design (randomization with comparison group)	13	50.0
4. Parallel replications at two or more sites	6	23.1
5. Procedures contain sufficient detail for replication	24	92.3
6. Baseline scores, characteristics, or measures reported	26	100.0
7. Intervention activities standardized or specified by curriculum, protocol, or manual	25	96.2
8. Dosage or percent of intervention received by participants discussed or enumerated	15	57.7
9. Measures have adequate psychometric properties & sufficient information provided	25	96.2
10. Objective source or collateral verification used in addition to self-report measures	6	23.1
11. Follow up conducted by person blind to treatment condition	3	11.5
12. Less than 70% follow-up rate or insufficient information provided	8	30.8
13. 70–84.9% follow-up rate	5	19.2
14. 85–100% follow-up rate	13	50.0
15. Dropouts and attrition enumerated or discussed	19	73.1
16. Rationale for type of analysis provided or appropriate analysis	24	92.3
17. Sample size considerations articulated or adequate statistical power	23	88.5

Note: One article included two sub-studies which were each rated using the MQRS (25 articles = 26 studies)