Use of modern contraception by the poor is falling behind.

PLoS Med · 2007 · PMC1796626 · PMID 17284155

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highly significantno p-value reported

This implies that if skilled birth attendance is acting as a proxy for supply of (or access to) services, it is highly significant not only for the national average but also for the poorest populations.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.