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Table 2 Univariate analysis of variables in the cycles with one or more oocytes retrieved and zero oocytes retrieved

From: Predictive factors for oocyte retrieval failure in controlled ovarian hyperstimulation protocols: a retrospective observational cohort study

  Oocyte retrieval (+) Oocyte retrieval (−) P value
No. of cycles/all cycles (%) 706/744 (94.9) 38/744 (5.1)
Age, years 37 (23–46)a 39 (31–46)a 0.01
Gravida per patient, n 0 (0–7)a 0 (0–6)a 0.25
Parity per patient, n 0 (0–3)a 0 (0–4)a 0.02
BMI, kg/m2 21 (16–36)a 21 (18–31)a 0.42
Infertility period, years 6 (0–18)a 7 (0–16)a 0.09
Previous treatment cycles, n 2 (1–16)a 2 (1–14)a 0.87
No. of cycles with GnRH agonist long/no. of cycles (%) 190/706 (69.4) 19/38 (50.0) 0.02
No. of cycles with GnRH antagonist/no. of cycles/ (%) 216/706 (30.6) 19/38 (50.0) 0.02
Duration of hMG/rFSH, days 11 (7–21)a 12 (8–20)a 0.49
Dose of hMG/rFSH, IU 1425 (150–4800)a 1500 (900–4800)a 0.20
Hormone levelsb    
 FSH, mIU/ml 13.4 (3.2–113.5)a 16.8 (7.5–43.5)a <0.001
 LH, mIU/ml 2.3 (0.1–26.8)a 3.8 (0.1–45.3)a 0.006
 PRL, ng/ml 30.7 (0.6–314)a 21.3 (9.3–56.8)a <0.001
 Estradiol, pg/ml 1717 (88–15,768)a 633 (62–1970)a <0.001
 Progesterone, ng/ml 0.77 (0.05–10.9)a 0.51 (0.1–6.48)a 0.02
Endometrial thicknessb, mm 10.9 (4.6–21.2)a 10.3 (6.2–17.2)a 0.51
No. of follicles over 15.5 mmb, n 4 (1–16)a 2 (1–6)a <0.001
  1. aMedian (range). bValues on the day of hCG injection. BMI: body mass index; GnRH: gonadotropin-releasing hormone; hMG: human menopausal gonadotropin; rFSH: recombinant follicle stimulating hormone; IU: international unit; LH, luteinizing hormone; PRL, prolactin; hCG: human chorionic gonadotropin