Funnel plot of studies that did and did not share IPD and reported live birth. Two-stage ITT analysis, outcome live birth. Blue triangles : studies that did share IPD. Red dots : studies that did not share IPD. Funnel plot representing all published trials and their reported endometrial scratching effect on live birth. The funnel (black dotted lines) indicates the lower and upper limits of the 95% confidence region. The black dotted mid-line is the pooled effect (OR) of endometrial scratching on live birth. The slight asymmetry to the left corner could indicate either publication bias or small study effect. IPD, individual participant data; Y-axis, standard error; X-axis, scratching effect on live birth, expressed as OR.