Table 4.

Cervical length and strain values ≤25^th centile of the entire cervix from the internal cervical os in women with spontaneous preterm delivery.

Patient	Gestational weeks at scan	Cervical length (mm)	Strain ≤ 0.14 (Yes/No)	Gestational weeks at delivery
1	18	18	No	22
2	16	27	No	23
3	17	36	No	24
4	19	16	No	25
5	22	6	No	25
6	18	29	No	27
7	18	36	No	33
8	21	32	No	33
9	21	5	No	33
10	18	35	No	34
11	16	39	No	35
12	16	42	Yes	35
13	21	22	No	35
14	21	28	No	35
15	23	36	No	35
16	24	22	No	35
17	18	32	No	36
18	18	35	No	36
19	19	16	No	36
20	19	37	No	36
21	20	44	No	36

Note: Strain was estimated using a cross sectional projection of the entire cervix at the level of the internal os