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Table 2 Prediction of early preterm delivery in women who had undergone cerclage for cervical shortening. 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 = 19) Delivery ≥35 week (n = 37) 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 33 (27;38) 31 (29;36) 1.01 (0.92,1.12) 0.758 0.757 - - -
Body mass index (kg/m2)c 24.8  (21.0; 30.4) 23.2 (20.2;27.2) 1.09 (0.96,1.23) 0.189 0.183 - - -
Previous preterm deliveryd 7 (36.8) 22 (59.5) 0.4 (0.13,1.24) 0.113 0.107 - - -
Previous second trimester miscarriaged 13 (68.4) 20 (54.1) 1.84 (0.58,5.9) 0.304 0.297 - - -
Previous conizationd 3 (15.8) 9 (24.3) 0.33 (0.09,1.21) 0.094 0.072 - - -
Pregnancy after IVF treatmentd 3 (15.8) 2 (5.4) 3.28 (0.5,21.6) 0.217 0.211 - - -
Urinary tract infection during pregnancyd 0 (0) 1 (2.7) 0 (0,Inf) 0.992 0.360 - - -
Parityc 0 8 (42.1) 4 (10.8) reference reference 0.292 - - -
  1 6 (31.6) 15 (40.5) 0.33 (0.02;5.03) 0.427 - - -
  ≥2 5 (26.3) 18 (48.6) 0 (0;inf) 0.996 - - -
Cigarette smokingd 3 (15.8) 7 (18.9) 0.8 (0.18,3.54) 0.772 0.770 - - -
Gestational age at cerclagec 16 (16;18) 16 (16;18) 1.14 (0.66,1.96) 0.634 0.633 - - -
CLe before cerclage (mm)c 17 (14;20) 23 (17;24) 0.89 (0.8,0.99) 0.036 f 0.028 f 0.98 (0.86,1.13) 0.808 0.809
CLe after cerclage (mm)c 14 (9;19) 27 (22;32) 0.82 (0.74,0.91) <0.001 f <0.001 f 0.85 (0.73,0.99) 0.041 0.024 f
Decrease in CLe after cerclaged 13 (68.4) 7 (18.9) 9.29 (2.61,33.06) <0.001 f <0.001 f Not included due to redundancy
CLe at the 20 gestational week (mm)c 16 (10;23) 24 (21;31) 0.84 (0.76,0.93) 0.001 <0.001 f 0.98 (0.82,1.16) 0.803 0.803
CLe at the 22 gestational week (mm)c 15 (5;23) 20 (16;29) 0.89 (0.83;0.97) 0.007 0.002 f 0.97 (0.87,1.08) 0.595 0.593
  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