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Table 3 Ovarian stimulation and embryological data for the high risk patients who injected hCG (n = 353) and either developed (n = 40) or did not develop severe OHSS (n = 313)

From: Outpatient management of severe early OHSS by administration of GnRH antagonist in the luteal phase: an observational cohort study

  N = 313 patients without severe OHSS N = 40 patients with severe OHSS p
Long protocol (n) 111 16  
Antagonist protocol (n) 202 24  
Duration of stimulation (days) 10.9 ± 1.5 10.6 ± 1.4 0.220
Total FSH (IU) 1909 ± 636 1890 ± 740 0.014
Number of follicles on day of hCG 29.0 ± 4.4 33.8 ± 7.0 <0.001
Oestradiol on day of hCG (pg/ml) 2956 ± 1289 3687 ± 1450 <0.001
Progesterone on day of hCG (ng/ml) 0.99 ± 0.44 1.1 ± 0.46 0.183
Number of oocytes retrieved 24.1 ± 6.1 32.0 ± 11.0 <0.001
Mature oocytes (in ICSI patients) 14.8 ± 6.6 20.7 ± 12.7 <0.001
Type of fertilization (IVF/ICSI/ IVF + ICSI) 72/160 /81 13/15/12 0.236
Number of 2PN 13.5 ± 10.3 18.4 ± 9.1 <0.001
Number of embryo transfers performed 303   
Day of embryo transfer (Day3/Day5) 131/172   
Number of embryos transferred 2.7 ± 0.6   
  1. Values are expressed as mean ± standard deviation (SD) unless otherwise stated. P-values in bold depict statistical significance (p < 0.05).