Name Country Type Number Characteristics Treatment
Goya 2015[16]
Spain
RCT
154
18-22week CL<25mm Arabin Pessary Conventional treatment
Nicolaided 2015[38]
Multiple center
RCT
1180
18-25weel CL unlimitated Arabin Pessary Conventional treatment
Liem 2013[31]
Netherlands
RCT
808
16-22week CL unlimitated Arabin Pessary Conventional treatment
Merced 2019[39]
Spain
RCT
132
24-34week CL<20mm Arabin Pessary Conventional treatment
Norman 2021[40]
UK
RCT
503
18-21week CL<35mm Arabin Pessary Conventional treatment
Dang 2019[22]
Vietnam
RCT
297
16-22week CL<38mm Arabin Pessary Vaginal progesterone400mg
Berghella 2017[41]
Multiple center
RCT
46
18-24week CL<30mm Arabin Pessary Conventional treatment