Which of the chemicals,when present in high levels in a woman's saliva,indicates a possible preterm birth?

Name: Which of the chemicals,when present in high levels in a woman's saliva,indicates a possible preterm birth?
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Estriol levels in a woman's saliva have been found to decrease significantly in the weeks leading up to preterm birth. Therefore, high levels of estriol may indicate a lower risk of preterm birth, while low levels may indicate a higher risk.

Which of the Chemicals,when Present in High Levels in a Woman's