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Rates of preterm birth in pregnancies with no syncope and pregnancies with syncope (categorized according to timing and frequency). Comparison between preterm birth rate in pregnancies with no syncope vs in pregnancies with syncope in first, second, and third trimesters statistically significant at P<0.01 (left panel), and comparison between preterm birth rate in pregnancies with no syncope vs in pregnancies with ≥1 syncope episode statistically significant at P=0.05 (right panel).
