Table 4.

Comparison of area under the ROC curve between CL at diagnosis alone and combination models for the prediction of spontaneous preterm delivery at <32 weeks of gestation in women with a short cervix treated with progesterone.

Model	AUC (95% CI)	p-Value *
CL	0.673 (0.448–0.898)	Reference
PP0 IOS (×0.1) + CL	0.794 (0.607–0.981)	0.105
PP1 IOS (×0.1) + CL	0.831 (0.575–1.000)	0.133
PP1 EOS (×0.1) + CL	0.827 (0.624–1.000)	0.103
PP0 IOS (×0.1) + PP1 IOS (×0.1) + CL	0.831 (0.561–1.000)	0.149
PP0 IOS (×0.1) + PP1 EOS (×0.1) + CL	0.858 (0.714–1.000)	0.041

ROC, receiver operating characteristic curve; CI, confidence interval; CL, cervix length at diagnosis; IOS, mean of internal os strain; EOS, mean of external os strain; PP0, baseline; PP1, 1 week postprogesterone. * Comparison between CL and other models.