은폐 방법에 대해 언급하지 않아 배정 순서 은폐가 이루어지지 않았을 것으로 판단되어 비뚤림 위험 높음으로 평가하였다.
As the concealment method was not mentioned, it was judged that the concealment of the order of allocation was not performed, so the risk of bias was high.