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Table 1 Patient characteristics in the training and the validation cohorts

From: Development and validation of a model for individualized prediction of cervical insufficiency risks in patients undergoing IVF/ICSI treatment

Characteristicsa

Developing set n = 3108

Validating set n = 1602

P

CI occurrence, n (%)

69 (2.22)

40 (2.50)

0.549

Age, years

31.44 ± 4.21

31.66 ± 4.26

0.722

Infertility duration, years

4.41 ± 2.96

4.43 ± 3.00

0.981

Twins pregnancy, n (%)

410 (13.19)

208 (12.98)

0.841

BMI, kg/m2

22.00 ± 3.05

22.04±3.07

0.641

FSH, IU/L

6.73 ± 1.83

6.72 ± 1.99

0.385

LH, IU/L

5.27 ± 2.68

5.34 ± 2.87

0.822

E2, pg/mL

39.17 ± 13.67

39.83 ± 13.64

0.080

T, ng/mL

0.33 ± 0.24

0.33 ± 0.24

0.923

Uterine length >  45 mm, n (%)

785 (25.26)

419 (26.15)

0.504

IVF/ICSI cycle

 1

1346 (43.31)

667 (41.63)

 

 2 or 3

976 (31.40)

540 (33.71)

 

 > 3

786 (25.28)

395 (24.65)

0.272

Median, (range)

2 (1–4)

2 (1–4)

0.153

Gravidity, n (%)

 < 1

1656 (53.28)

833 (52.00)

 

 1 or 2

1239 (39.86)

655 (40.89)

 

 > 2

213 (6.85)

114 (7.12)

0.701

Median, (range)

0 (0–4)

0 (0–4)

0.306

Hysteroscopic surgery, n (%)

  

0.064

 Yes

1231 (39.61)

672 (41.94)

 

 No

1877 (60.39)

930 (58.06)

 
  1. Abbreviations: BMI, body mass index; FSH, follicular stimulating hormone; E2, estrogen; T, testosterone; IVF/ICSI, in vitro fertilization/ intracytoplasmic sperm injection; CI, cervical insufficiency
  2. a Continuous variable are expressed as mean ± standard deviation, SD, categorical variables as absolute frequencies, n (%)