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Study flowchart.

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Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) guideline.

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Univariable logistic regression for preterm birth per variable before each childbirth.

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Logistic regression for preterm birth for women with no CIN, untreated CIN, and treated CIN before each childbirth.

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Logistic regression for preterm birth per volume taken from the cervix before each childbirth.

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Logistic regression for preterm birth per grade of CIN and volume taken from the cervix before each childbirth.

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Logistic regression for maternal outcomes for women with no CIN, untreated CIN, and treated CIN before each childbirth.

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Logistic regression for neonatal outcomes for women no CIN, untreated CIN, and treated CIN before each childbirth.

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Spontaneous births by gestational age for women with no CIN, untreated CIN, or treated CIN before each childbirth.

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Spontaneous births by gestational age per severity of cervical disease before each childbirth.