Population attributable risk of unintentional childhood poisoning in Karachi Pakistan.

PLoS One · 2011 · PMC3202591 · PMID 22046391

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showed a trendno p-value reported

Socioeconomic status showed a trend of increasing PAR with decreasing economic status.

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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.