In addition, the types of research methodologies were varied with greatest number of original research articles using secondary data analyses (n = 76). The next most common research designs were survey instruments (n = 64), content analyses (n = 53), and interview (n = 28) methodologies. Lastly, case studies (n = 20) were more frequent than quasi-experiments (n = 14), experiments (n = 3), and other design methodologies (see Figure 4).