despite obtaining written consent from patients to participate in the study, they only knew that they would participate in the study to find the best way to get rid of pregnancy products after first trimester abortion, but they did not know which group of drugs was included in the drug coding (one-way blinding).the ampoules and tablets were presented to the researchers in similar syringes and covers respectively (with special codes ) so that it could not be identified for the researchers. Accordingly, the researchers who assisted patients in prescribing the drug, although they knew what the drug's content was in each package, were unaware of the research hypotheses, so they did not know which intervention group and which control group to use , It should be noted that the participants in each group were unaware of the drug regime of the opposite group.(double-blinding). And because the drugs were prescribed to patients with a coding system, the researcher did not know when the data was analyzed until the final calculations were performed. Because the researcher knew about the coding system and the researchers did not know about this system, but the data reached the researcher with numbers 1, 2 and 3, so the researcher did not know until the end of the analysis and before generalizing the calculations to the groups that the numbers one and Two or three belong to which codes A, B and C. It is obvious that the researcher's help wrote down the numbers belonging to the codes somewhere and gave them to the researcher after analyzing the data. In this research, three-way blinding technique was found.
Coding system: control group: a, second group: b, third group: c (when delivering drug envelopes coded by the researcher with the help of the researcher)
Group naming system with numbers: control group: 1, second group: 2, third group: 3 (when delivering data on therapeutic effects and side effects by the researcher to the researcher)
Note: Research Assistant for Researcher after Data Analysis: Control Group: A-1, Second Group: B-2, Third Group C-3.