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Table 3 Prediction of early preterm delivery in women who had undergone cerclage regardless of cervical length. Results of the univariate and multivariate analysis

From: The predictive value of sequential cervical length screening in singleton pregnancies after cerclage: a retrospective cohort study

   

Univariate analysis

Multivariate analysis

 

Delivery <35 week (n = 5)

Delivery ≥35 week (n = 27)

OR (95 % CI)a

P

P

Adjusted OR (95 % CI) a

P

P

(Wald’s test)

(LR test)b

(Wald’s test)

(LR test)b

Age (years)c

31 (29;39)

31 (29;35)

1.09 (0.89;1.34)

0.413

0.401

-

-

-

Body mass index (kg/m2)c

23.2 (19.6;24.4)

25.7 (21.4;29.4)

0.84 (0.65;1.09)

0.191

0.124

-

-

-

Previous preterm deliveryd

2 (40.0)

9 (33.3)

1.33 (0.19;9.47)

0.774

0.775

-

-

-

Previous second trimester miscarriaged

4 (80)

22 (81.5)

1.27 (0.10;34.76)

1.000

1.000

-

-

-

Previous conizationd

1 (20.0)

2 (7.4)

3.12 (0.23,43.02)

0.394

0.420

-

-

-

Pregnancy after IVF treatmentd

0

0

-

-

-

-

-

-

Urinary tract infection during pregnancyd

0

1 (3.7)

0 (0;inf)

0.995

0.557

-

-

-

Parityd

0

2 (40.0)

5 (18.5)

0.63 (0.19,2.06)

0.447

0.583

-

-

-

 

1

1 (20.0)

9 (33.3)

0.28 (0.02;3.88)

0.341

-

-

-

 

≥2

2 (40.0)

13 (48.2)

0.38 (0.04;3.52)

0.398

-

-

-

Cigarette smokingd

1 (20.0)

4 (14.8)

1.44 (0.13;16.41)

0.770

0.750

-

-

-

Gestational age at cerclagec

15 (14;18)

16 (14;17)

1.02 (0.58;1.82)

0.941

0.942

-

-

-

CLe before cerclage (mm)c

33 (31;35)

37 (34;40)

0.82 (0.65;1.04)

0.098

0.066

1.06 (0.95,1.19)

0.283

0.260

CLe after cerclage (mm)c

30 (19;33)

42 (35;47)

0.72 (0.51;1.01)

0.055

<0.001 f

0.85 (0.75;0.96)

0.007

0.004 f

Decrease in CLe after cerclaged

4 (80.0)

5 (18.5)

17.6 (1.60;193.34)

0.019

0.008 f

Not included due to redundancy

CLe at the 20 gestational week (mm)c

30 (19;31)

40 (29;45)

0.91 (0.83;1.01)

0.069

0.046 f

1.01 (0.90:1.14)

0.875

0.876

CLe at the 22 gestational week (mm)c

19 (12;25)

38 (26;43)

0.89 (0.79;0.99)

0.049

0.019 f

0.94 (0.86;1.03)

0.170

0.157

  1. a OR (95 % CI) = odds ratio (95 % confidence interval), b LR test = likelihood ratio test, c Continuous variable, provided in median (interquartile range); d nominal variable, provided in n (%); e CL = cervical length; f Italic letters indicate statistical significance; g despite its significant predictive value in the univariate analysis, the parameter “cervical length before cerclage” was not included in the multivariate model due to its co-linear association with the parameter “cervical length after cerclage” that was more predictive in the univariate analysis