THE VALUE OF CST 4IN PREDICTING PRETERM BIRTH o association between cst 4 and preterm birth was present at every time window during gestation c 0.75 CS 80.50 E 0.25 T12345 0.00 Weeks at Sampling 12THE VALUE OF CST 4 IN PREDICTING PRETERM BIRTH  Association between CST 4 and preterm birth was present at every time window during gestation. 12