Effects of socioeconomic position and clinical risk factors on spontaneous and iatrogenic preterm birth.

BMC Pregnancy Childbirth · 2014 · PMC3987165 · PMID 24670050

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an increasing trendno p-value reported

Spontaneous preterm birth rates showed an increasing trend over calendar time but the rate in 2000–2003 was not significantly higher than the rate in 1988–1990 (adjusted rate ratio 1.09, 95% CI 0.98, 1.20).

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