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. 2012 Sep 10;11:319. doi: 10.1186/1475-2875-11-319

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Copyright ©2012 Griffin et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Population average growth curves for umbilical artery resistance index by early pregnancy malaria parasitaemia exposure. Kinshasa, Democratic Republic of Congo, 2005–2006. A. The unadjusted effect of early pregnancy malaria parasitaemia on umbilical artery resistance index (n = 547 visits). B. The adjusted effect of early pregnancy malaria parasitaemia on umbilical artery resistance index by gravidity. Model adjusted for foetal sex and low education; interaction terms: (early pregnancy malaria parasitaemia * gestational age in weeks) -2LL test p = 0.025; (early pregnancy malaria parasitaemia * primigravidae) -2LL test p = 0.025, with 1 df (n = 540 visits). The overall standard deviation for UA RI was 0.089.