Preterm subtypes by immigrants' length of residence in Norway: a population-based study.

BMC Pregnancy Childbirth · 2014 · PMC4223612 · PMID 25048200

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a significant trendno p-value reported

Relative to immigrants with residence of 0–4 years there was a significant trend with increasing length of residence for non-spontaneous PTD, but not for spontaneous PTD.

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