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. 2023 Sep 1;110:108772. doi: 10.1016/j.ijscr.2023.108772

Table 1.

Characteristics of the studies.

Author Year Location Type of study N Follow-up (months) Dysmenorrhea reduced Menstrual reduced LNG-IUS expulsion/downward
Zhu et al. [9] 2021 China Video 1 12 Yes Yes 0
Huang et al. [4] 2022 China Video 2 3 Yes Yes 0
Zhang et al. [8] 2022 China Research article 12 16 Yes Yes 1/2