Table 1 Characteristics of included studies
Authors | year | Study design | Patients /cycles | Interventions | Basic information | ||
|---|---|---|---|---|---|---|---|
Cases | Controls | Cases | Controls | ||||
Shabnam Salemi et al | 2021 | RCT | 93 | 95 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: < 37 years; BMI: unknown; Normal uterine cavity |
Zhang Jianmei et al | 2020 | Case-controlled | 79 | 67 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: from 21 to 35 years; BMI: between 18 and 29 kg/m2; Normal uterine cavity |
Aghahoseini Marieh et al | 2020 | RCT | 88 | 90 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: from 18 to 40 years; BMI: ≤ 30 kg/m2; Normal uterine cavity |
L Luo et al | 2020 | RCT | 172 | 171 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: from 20 to 40 years; BMI: unknown; Normal uterine cavity |
Zhang Fan | 2020 | Case-controlled | 65 | 72 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: < 38 years; BMI: unknown; Normal uterine cavity |
Bai Jingying et al | 2020 | Case-controlled | 124 | 369 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: from 20 to 34 years; BMI: unknown; Normal uterine cavity |
Zhu Aizhen et al | 2020 | Case-controlled | 32 | 38 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: unknown; BMI: unknown; Normal uterine cavity |
Sun Xiaoxiao et al | 2019 | Case-controlled | 221 | 332 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: unknown; BMI: unknown; Normal uterine cavity |
Li Jing et al | 2019 | Case-controlled | 65 | 65 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: from 23 to 38 years; BMI: between 22 and 27 kg/m2; Normal uterine cavity |
He Xiao et al | 2019 | RCT | 18 | 14 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: < 35 years; BMI: unknown; Normal uterine cavity |
Ji Xiaoyuan et al | 2019 | Case-controlled | 225 | 347 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: ≤ 39 years; BMI: unknown; Normal uterine cavity |
Di XIE et al | 2018 | Case-controlled | 48 | 98 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: unknown; BMI: unknown; Normal uterine cavity |
Hsiao-Wen Tsai et al | 2017 | Case-controlled | 29 | 31 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: from 20 to 45 years; BMI: unknown; Normal uterine cavity |
Zhang Jingshun et al | 2017 | Case-controlled | 76 | 76 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: unknown; BMI: unknown; Normal uterine cavity |
Wang Xiaoyan et al | 2015 | Case-controlled | 53 | 58 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: unknown; BMI: unknown; Normal uterine cavity |
Jiang Chenglong et al | 2015 | Case-controlled | 92 | 98 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: unknown; BMI: unknown; Normal uterine cavity |
Jie Di et al | 2014 | Case-controlled | 51 | 88 | Endometrial preparation with GnRH-a pretreatment | Endometrial preparation without GnRH-a pretreatment | Women with PCOS undergoing FET cycles; Age: ≤ 35 years; BMI: ≤ 30kg/m2; Normal uterine cavity |