Information in this section relies on studies included in the HomVEE review. For NFP, we reviewed 47 publications, including 27 publications about 5 randomized controlled trials. We also reviewed 1 single case design and 19 standalone implementation studies. (Please see Studies for Implementation Experiences for a list of the studies and to link to the characteristics of the samples examined in the effectiveness studies.)
Of the 47 publications reviewed, 31 were based on at least one of three groups of participants. Throughout this section, we refer to these three samples: the Elmira sample (10 publications), the Memphis sample (12 publications), and the Denver sample (4 publications). Five publications compared and contrasted the experiences and outcomes of more than one of these three samples. Sixteen publications examined the implementation of NFP in samples other than these three. Information about the sample of participants included in the other studies is noted when available.
In the following sections, we consider all pieces of research about a particular sample to be a single study. For example, we cite all 10 publications on the Elmira sample as one study. We counted the 16 publications on other samples as 15 separate studies (one sample has two publications). The total number of distinct study samples included in our counts is therefore 18.