Can primary care data be used to monitor regional smoking prevalence? An analysis of The Health Improvement Network primary care data.

BMC Public Health · 2011 · PMC3198710 · PMID 21981754

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may be significantno p-value reported

A final limitation of this study is that the significantly diminished sample sizes of the GLF at the regional level mean that there may be significant error in its estimates.

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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.