비무작위 배정 실험연구를 한 논문 6편에서 대상군 선정 항목에서는 3편 높음, 2편 낮음 1편 불확실이었다.
In the selection item of the target group in the six papers which conducted a random assignment experimental research, three papers were "High", two were "Low" and one was "Uncertain".