Fig. 4From: Comparative effectiveness of recombinant human follicle-stimulating hormone alfa (r-hFSH-alfa) versus highly purified urinary human menopausal gonadotropin (hMG HP) in assisted reproductive technology (ART) treatments: a non-interventional study in GermanySecondary outcomes in the overall population adjusted for possible confounding factors. Differences between study groups were adjusted for possible confounding factors via inverse probability of treatment weighting using a propensity score estimated by boosted regression trees. HR, hazard ratio. *p = 0.548; **p = 0.003Back to article page