Population-based trends in pregnancy hypertension and pre-eclampsia: an international comparative study.

BMJ Open · 2011 · PMC3191437 · PMID 22021762

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a decreasing trendno p-value reported

The change in NSW from ICD-9 in 1997 to ICD-10 in 1998 coincided with a shift from an increasing to a decreasing trend in pregnancy hypertension, suggesting that the impact of the ICD version should not be disregarded.

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