it mean that person not in the stage of disease which shows symptoms but he has organisms in body which cause disease. if the number of microorganism is increased 40 percent, it shows symptoms
OR, it could apply to the childbirth process. Basically how much the cervical opening has pulled back or thinned. But this is also tied to how much the cervix has dilated, or opened up to allow the child to be born. Fully dilated is 10 cm.
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During delivery , the cervix opens ( dilates) and thins (effaces) for a vaginal delivery. For a standard routine delivery you must be 100% effaced and 10 cm dilated. so recording of 4cm dilated and 70% effaced indicated you are entering the final stages of preparing the baby for delivery.
It means the cervix is open a little less than an inch, and it has thinned by 30 percent.