Clinical parameters of early ovarian hyperstimulation syndrome (OHSS) by trigger of oocyte maturation administered. A, Scattergram (median ± IQR) of mean ovarian volume at 2‐6 d following oocyte retrieval during IVF treatment in patients triggered with either human chorionic gonadotrophin (hCG) (n = 40), GnRH agonist (GnRHa; n = 99), or kisspeptin (n = 122). Baseline prestimulation median ovarian volume before stimulation with any of the 3 triggers is also presented. The three trigger groups were compared by the Kruskal‐Wallis test with post hoc Dunn's correction for multiple comparisons. ****P < .0001. B, Scattergram (median ± IQR) of maximal ovarian volume (largest ovarian volume of either ovary) at 2‐6 d following oocyte retrieval during IVF treatment in patients triggered with either hCG (n = 40), GnRH agonist (GnRHa; n = 99), or kisspeptin (n = 122). Groups were compared by the Kruskal‐Wallis test with post hoc Dunn's correction for multiple comparisons. ***P < .001, ****P < .0001. C, Scattergram (median ± IQR) of percentage increase in mean ovarian volume at 2‐6 d following oocyte retrieval when compared to prestimulation baseline values before IVF treatment in patients triggered with either hCG (n = 30), GnRH agonist (GnRHa; n = 90), or kisspeptin (n = 122). Groups were compared by the Kruskal‐Wallis test with post hoc Dunn's correction for multiple comparisons. ****P < .0001. D, Scattergram of total ascitic volume (median ± IQR) (free fluid in pouch of Douglas, adnexae and abdomen) at 2‐6 d following oocyte retrieval during IVF treatment in patients triggered with either hCG (n = 40), GnRH agonist (GnRHa; n = 99), or kisspeptin (n = 122). Groups were compared by Kruskal‐Wallis test with post hoc Dunn's correction for multiple comparisons. ****P < .0001