Fig. 4

Network plots of comparisons on live birth and ongoing pregnancy (regardless of the initiations of luteal phase supports). A Live birth; B Ongoing pregnancy. Size of node is proportional to number of arms randomized to each treatment (number of patients in brackets). Line width is proportional to number of randomized controlled trials comparing each pair of treatments. HCG = human chorionic gonadotrophin; VPP = vaginal progesterone pessary; VPG = vaginal progesterone gel; IMP = intramuscular progesterone; OP = oral progesterone; RP = rectal progesterone; GnRH = gonadotropin releasing hormone; E = oestrogen; SCP = subcutaneous progesterone; VPR = vaginal progesterone ring