The incidence of preventive interventions for early OHSS by GnRH agonist triggering (1.6% vs. 4.2%) and the incidence of early OHSS and/or preventive interventions (6.1% vs. 11.0%)) was lower in the follitropin delta group than in the follitropin alfa group (Table 2). Here, GNRH1 is linked to ovarian hyperstimulation syndrome.