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PRETERM LABOR AND PROM: - ANTHC

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Normal Pattern of Uterine<br />

Activity Night: Day Ratio<br />

• 20 wks 1.8:1<br />

• 30 wks 2.3:1<br />

• 40 wks 2.8:1<br />

• 67% of all contractions occurred after dark

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