“…Only 9 studies (5.7%), all from the quantitative peer-reviewed literature, used a comparison group design. 38,49,87,90,115,121,138,141,162 Nearly half of all studies (N=75) were analytic observational, 1 , 2 3 , 2 6 , 2 8 , 3 1 , 3 4 , 3 7 , 4 1 , 4 6 -4 8 , 5 0 , 5 1 , 5 5 , 5 8 -6 1 , 6 7 , 7 1 , 7 134,137,140,142,143,[146][147][148]150,153,[157][158][159][160][161]163,[166][167][168]170,172 34.2% (N=54) were experimental or quasi-experimental, 8,11,27,29,32,33,35,38,42,43,45,49,[51][52][53]56,65,70,…”