Table 1 Patient demographics, duration of and reasons for infertility and cycle characteristics before and after regulations

Age, years, mean ± SD

32.63 ± 5.55

33.24 ± 5.37

^a < 0.001*

Maternal BMI (kg/m²), mean ± SD

25.48 ± 4.54

25.04 ± 4.53

^a < 0.001*

Previous cycle number, mean ± SD

2.29 ± 1.69

3.48 ± 2.69

^a < 0.001*

Duration of infertility, years, mean ± SD

7.59 ± 5.38

5.74 ± 4.54

^a < 0.001*

 Male Factor

4399 (34.5)

6219 (33.2)

^b0.016*

 Diminished ovarian reserve

1742 (13.6)

3478 (18.5)

^b < 0.001*

 Endometriosis

424 (3.3)

734 (3.9)

^b0.006*

 Ovulatory dysfunction

1073 (8.4)

1057 (5.6)

^b < 0.001*

 Genetics

652 (5.1)

875 (4.7)

^b0.08

 Recurrent spontaneous abortion

321 (2.5)

839 (4.5)

^b < 0.001*

 Tubal Factor

1796 (14.0)

2301 (12.3)

^b < 0.001*

 Unexplained infertility

2334 (18.3)

3215 (17.2)

^b0.01*

Number of aspirated oocytes, mean ± SD

12.90 ± 7.81

11.62 ± 8.63

^a < 0.001*

MII, mean ± SD

9.39 ± 5.98

9.33 ± 7.03

^a0.406

PN2, mean ± SD

7.37 ± 4.48

7.81 ± 6.01

^a < 0.001*

 1

1803 (14.1)

10,600 (56.6)

 2

4105 (32.2)

8120 (43.4)

 3

4025 (31.6)

–

 4

1916 (15.0)

–

 5

882 (6.8)

–

 D2–3

5977 (46.9)

2647 (14.1)

 D4

3448 (27.0)

2225 (11.9)

 D5–6

3316 (26.1)

13,846 (74)