Fig. 2

Network plots of comparisons on live birth and ongoing pregnancy of different luteal phase supports in patients undergoing fresh cycles. A Live birth; B Ongoing pregnancy. Size of node is proportional to number of arms randomized to each treatment (numbers of subgroup patients with early and delayed luteal phase supports are presented 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