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. 2013 Jun 12;3(6):e002507. doi: 10.1136/bmjopen-2012-002507

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Trends in the percentage of antenatal-care use by (A) woman's education, (B) partner's education, (C) wealth index, 1993–2008. Note: Concentration index based on wealth index in 1993 (0.19, 95% CI 0.16 to 0.21); 1998 (0.18, 95% CI 0.16 to 0.21); 2003 (0.12, 95% CI 0.09 to 0.14); and 2008 (0.09, 95% CI 0.07 to 0.11).