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Outcomes description:
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Maternal weight gain
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Preterm delivery
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Results:
Women with low rate of weight gain (< 0.27 kg/wk) had a 60% higher risk for spontaneous preterm birth compared with those with average weight gain (0.27-0.52 kg/wk). They were also more than twice as likely to deliver preterm as women with a high rate of gain (> 0.52 kg/wk) (OR = 2.54; 95% CI 1.49, 4.88).
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Maternal confounders/effect modifiers:
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Dietary intake
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Use of cigarettes, alcohol, and illicit drugs
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Pre-pregnancy weight/height
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Age
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Income
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Marital status
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Race
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Use of vitamin supplements
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Whether or not pregnancy was planned
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