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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