To meet HHS’ criteria for an “evidence-based early childhood home visiting service delivery model,” models must meet at least one of the following criteria:
- At least one high- or moderate-quality impact study of the model finds favorable, statistically significant impacts in two or more of the eight outcome domains
- At least two high- or moderate-quality impact studies of the model using non-overlapping analytic study samples find one or more favorable, statistically significant impacts in the same domain
In both cases, the impacts must either (1) be found in the full sample or (2) if found for subgroups but not for the full sample, be replicated in the same domain in two or more studies using non-overlapping analytic study samples. Additionally, following the statute, if the model meets the above criteria based on findings from randomized controlled trial(s) only, then one or more favorable, statistically significant impacts must be sustained for at least one year after program enrollment, and one or more favorable, statistically significant impacts must be reported in a peer-reviewed journal.1
For results from single-case designs to be considered towards the HHS criteria, additional requirements must be met:
- At least five studies examining the intervention meet the WWC’s pilot single-case design standards without reservations or standards with reservations (equivalent to a high or moderate rating in HomVEE, respectively).
- The single-case designs are conducted by at least three research teams with no overlapping authorship at three institutions.
- The combined number of cases is at least 20.
1 These criteria are consistent with the MIECHV statute: Section 511 (d)(3)(A)(i)(I)