Table 1 Background and treatment characteristics

Background information

IVF Group (N = 24)

OHSS Group (N = 35)

p

Age (yrs)^a

34.0 ± 2.6

33.1 ± 3.5

0.26

BMI (kg/m²)^a

23.6 ± 3.4

22.5 ± 3.2

0.23

Smoking^b

0.35

Yes

2 (8.3)

1 (2.9)

No

22 (91.7)

34 (97.1)

Previous OHSS^b

0.12

Yes

6 (26.1)

3 (10)

No

17 (73.9)

27 (90)

PCO^b

0.16

Yes

6 (26.1)

13 (44.8)

No

17 (73.9)

16 (55.2)

Duration of infertility (yrs)^a

4.9 ± 2.9

4.1 ± 2.3

0.28

AMH (µg/L)^c,d

3.6 (3.0-4.1)

2.7 (1.9–4.2)

0.25

Treatment characteristics

IVF Group (N = 24)

Early (N = 25)

Late (N = 12)

Protocol^b

< 0.05

Agonist

24 (100)

17 (68)

9 (75)

Antagonist

0 (0)

8 (32)

3 (25)

FSH starting dose (IU)^c

150 (150–200)

150 (150–225)

150 (150–250)

0.69

FSH cumulative dose (IU)^c

1650 (1650–2000)

1375 (1200–1600)

1688 (1500–2400)

0.08

Number of follicles^c

17 (14–26)

38 (29–48)

21 (21–25)

< 0.001

E2 OPU2 (nmol/L)^c

3.7 (2.1–4.2)

NA

NA

NA

E2 Admission (nmol/L)^c,e

NA

9.7 (7.2–13.5)

7.4 (6.5–10.1)

0.44

E2 OPU7 (nmol/L)^c

3.0 (2.3–4.1)

8.6 (5.9–11.8)

NA

< 0.001

Luteal support^b

0.19

Vaginal progesterone

24 (100)

15 (100)

11 (91.7)

hCG

0 (0)

0 (0)

1 (8.3)

Embryo transfer^b

< 0.001

None

0 (0)

10 (40)

0 (0)

One embryo

23 (95.8)

14 (56)

9 (75)

Two embryos

1 (4.2)

1 (4)

3 (25)

Pregnancy^b

< 0.001

Yes

12 (50)

6 (24)

12 (100)

No

12 (50)

19 (76)

0 (0)