Transvaginal Sonographic Evaluation of the Cervix in Asymptomatic Singleton Pregnancy and Management Options in Short Cervix

Table 2

Studies of CL measured by transvaginal ultrasonography to predict preterm birth in low-risk women.

Authors	𝑛	GW at testing	Outcome (GW)	Cutoff value (mm)	Sen. (%)	Spec. (%)	PPD (%)	NPD (%)
Tongsong et al. [6]	730	28–30	<37	<35	65.9	62.4	19.4	92.8
	2915	24	<35	≤30	54.0	76.3	9.3	97.4
Iams et al. [47]		24	<35	≤25	37.3	92.2	17.8	97.0
	2531	28	<35	≤30	69.9	68.5	7.0	98.5
		28	<35	≤25	49.4	86.8	11.3	98.0
Fukami et al. [58]	3030	16–19	22–31	≤30	50.0	98.5	8.3	99.9
			32–36	≤30	18.2	98.9	33.3	97.6
Pires et al. [59]	338	21–24	<37	<20	18.0	98.1	40.0	94.8
			<35	<20	27.3	97.9	30.0	97.6
Barber et al. [7]	2351	18–22	<37	<30	39.0	92.0	31.0	94.0